Error running LinearProblem on poisson demo on MacOS-conda env

dolfinx
1

I am using the provided dolfinx conda env on macOS with the following dependencies :

# Name                                  Version          Build                    Channel
_python_abi3_support                    1.0              hd8ed1ab_2               conda-forge
aiohappyeyeballs                        2.6.1            pyhd8ed1ab_0             conda-forge
aiohttp                                 3.13.0           py311hdaf2c26_0          conda-forge
aiosignal                               1.4.0            pyhd8ed1ab_0             conda-forge
aom                                     3.9.1            hf036a51_0               conda-forge
appnope                                 0.1.4            pyhd8ed1ab_1             conda-forge
asttokens                               3.0.0            pyhd8ed1ab_1             conda-forge
attrs                                   25.4.0           pyh71513ae_0             conda-forge
blosc                                   1.21.6           hd145fbb_1               conda-forge
brotli                                  1.1.0            h1c43f85_4               conda-forge
brotli-bin                              1.1.0            h1c43f85_4               conda-forge
brotli-python                           1.1.0            py311h7b20566_4          conda-forge
bzip2                                   1.0.8            h500dc9f_8               conda-forge
c-ares                                  1.34.5           hf13058a_0               conda-forge
c-blosc2                                2.21.3           h415348b_0               conda-forge
ca-certificates                         2025.10.5        hbd8a1cb_0               conda-forge
cached-property                         1.5.2            hd8ed1ab_1               conda-forge
cached_property                         1.5.2            pyha770c72_1             conda-forge
cairo                                   1.18.4           h950ec3b_0               conda-forge
cctools_osx-64                          1024.3           llvm19_1_h3b512aa_5      conda-forge
certifi                                 2025.10.5        pyhd8ed1ab_0             conda-forge
cffi                                    1.16.0           py311hc0b63fd_0          conda-forge
cftime                                  1.6.4            py311h0e52b60_2          conda-forge
charset-normalizer                      3.4.4            pyhd8ed1ab_0             conda-forge
clang                                   19.1.7           default_h1323312_5       conda-forge
clang-19                                19.1.7           default_hc369343_5       conda-forge
clang_impl_osx-64                       19.1.7           hc73cdc9_25              conda-forge
clang_osx-64                            19.1.7           h7e5c614_25              conda-forge
cli11                                   2.5.0            h92383a6_0               conda-forge
comm                                    0.2.3            pyhe01879c_0             conda-forge
compiler-rt                             19.1.7           he914875_1               conda-forge
compiler-rt_osx-64                      19.1.7           h138dee1_1               conda-forge
contourpy                               1.3.3            py311hd4d69bb_2          conda-forge
cpython                                 3.11.14          py311hd8ed1ab_1          conda-forge
cycler                                  0.12.1           pyhd8ed1ab_1             conda-forge
cyrus-sasl                              2.1.28           h610c526_0               conda-forge
dav1d                                   1.2.1            h0dc2134_0               conda-forge
dbus                                    1.16.2           h27bd348_0               conda-forge
debugpy                                 1.8.17           py311h1854d6b_0          conda-forge
decorator                               5.2.1            pyhd8ed1ab_0             conda-forge
double-conversion                       3.3.1            h240833e_0               conda-forge
eigen                                   3.4.0            hfc0b2d5_1               conda-forge
exceptiongroup                          1.3.0            pyhd8ed1ab_0             conda-forge
executing                               2.2.1            pyhd8ed1ab_0             conda-forge
expat                                   2.7.1            h21dd04a_0               conda-forge
fenics-basix                            0.9.0            py311h25152e5_4          conda-forge
fenics-basix-nanobind-abi               0.2.8.19         py313h70ed5a5_4          conda-forge
fenics-dolfinx                          0.9.0            py311h3bbc424_118        conda-forge
fenics-ffcx                             0.9.0            pyh2e48890_0             conda-forge
fenics-libbasix                         0.9.0            py311h573253e_4          conda-forge
fenics-libdolfinx                       0.9.0            py311haa1a4f7_118        conda-forge
fenics-ufcx                             0.9.0            hb7f7608_0               conda-forge
fenics-ufl                              2024.2.0         pyhd8ed1ab_1             conda-forge
ffmpeg                                  8.0.0            gpl_h5f853a7_106         conda-forge
fftw                                    3.3.10           mpi_openmpi_h3b45436_10  conda-forge
fmt                                     11.2.0           hbf61d64_0               conda-forge
font-ttf-dejavu-sans-mono               2.37             hab24e00_0               conda-forge
font-ttf-inconsolata                    3.000            h77eed37_0               conda-forge
font-ttf-source-code-pro                2.038            h77eed37_0               conda-forge
font-ttf-ubuntu                         0.83             h77eed37_3               conda-forge
fontconfig                              2.15.0           h37eeddb_1               conda-forge
fonts-conda-ecosystem                   1                0                        conda-forge
fonts-conda-forge                       1                0                        conda-forge
fonttools                               4.60.1           py311he13f9b5_0          conda-forge
freetype                                2.14.1           h694c41f_0               conda-forge
fribidi                                 1.0.16           h8616949_0               conda-forge
frozenlist                              1.7.0            py311h7a2b322_0          conda-forge
gdk-pixbuf                              2.44.3           h07555a4_0               conda-forge
glslang                                 16.0.0           h4770549_0               conda-forge
gmp                                     6.3.0            hf036a51_2               conda-forge
graphite2                               1.3.14           h21dd04a_2               conda-forge
h2                                      4.3.0            pyhcf101f3_0             conda-forge
h5py                                    3.15.1           nompi_py311hc8b82f0_100  conda-forge
harfbuzz                                12.1.0           hc5d3ef4_0               conda-forge
hdf4                                    4.2.15           h8138101_7               conda-forge
hdf5                                    1.14.6           mpi_openmpi_h8bfb534_3   conda-forge
hpack                                   4.1.0            pyhd8ed1ab_0             conda-forge
hyperframe                              6.1.0            pyhd8ed1ab_0             conda-forge
hypre                                   2.32.0           mpi_openmpi_ha6d64cb_1   conda-forge
icu                                     75.1             h120a0e1_0               conda-forge
idna                                    3.11             pyhd8ed1ab_0             conda-forge
importlib-metadata                      8.7.0            pyhe01879c_1             conda-forge
importlib_metadata                      8.7.0            h40b2b14_1               conda-forge
ipykernel                               7.0.1            pyh5552912_0             conda-forge
ipython                                 9.6.0            pyhfa0c392_0             conda-forge
ipython_pygments_lexers                 1.1.1            pyhd8ed1ab_0             conda-forge
jedi                                    0.19.2           pyhd8ed1ab_1             conda-forge
jsoncpp                                 1.9.6            h466cfd8_1               conda-forge
jupyter_client                          8.6.3            pyhd8ed1ab_1             conda-forge
jupyter_core                            5.9.0            pyhc90fa1f_0             conda-forge
kahip                                   3.19             h3e32c55_1               conda-forge
kiwisolver                              1.4.9            py311ha94bed4_1          conda-forge
krb5                                    1.21.3           h37d8d59_0               conda-forge
lame                                    3.100            hb7f2c08_1003            conda-forge
lcms2                                   2.17             h72f5680_0               conda-forge
ld64_osx-64                             955.13           llvm19_1_h466f870_5      conda-forge
lerc                                    4.0.0            hcca01a6_1               conda-forge
libabseil                               20250512.1       cxx17_hfc00f1c_0         conda-forge
libadios2                               2.10.2           mpi_openmpi_h8855da3_12  conda-forge
libaec                                  1.1.4            ha6bc127_0               conda-forge
libamd                                  3.3.3            ha5840a7_7100102         conda-forge
libass                                  0.17.4           h87c4fc2_0               conda-forge
libblas                                 3.9.0            37_he492b99_openblas     conda-forge
libboost                                1.88.0           hf9ddd82_5               conda-forge
libboost-devel                          1.88.0           h7a7523a_5               conda-forge
libboost-headers                        1.88.0           h694c41f_5               conda-forge
libbrotlicommon                         1.1.0            h1c43f85_4               conda-forge
libbrotlidec                            1.1.0            h1c43f85_4               conda-forge
libbrotlienc                            1.1.0            h1c43f85_4               conda-forge
libbtf                                  2.3.2            hca54c18_7100102         conda-forge
libcamd                                 3.3.3            hca54c18_7100102         conda-forge
libcblas                                3.9.0            37_h9b27e0a_openblas     conda-forge
libccolamd                              3.3.4            hca54c18_7100102         conda-forge
libcholmod                              5.3.1            h7ea7d7c_7100102         conda-forge
libclang-cpp19.1                        19.1.7           default_hc369343_5       conda-forge
libclang13                              21.1.3           default_h7f9524c_0       conda-forge
libcolamd                               3.3.4            hca54c18_7100102         conda-forge
libcurl                                 8.14.1           h5dec5d8_0               conda-forge
libcxx                                  21.1.3           h3d58e20_0               conda-forge
libdeflate                              1.24             hcc1b750_0               conda-forge
libedit                                 3.1.20250104     pl5321ha958ccf_0         conda-forge
libev                                   4.33             h10d778d_2               conda-forge
libevent                                2.1.12           ha90c15b_1               conda-forge
libexpat                                2.7.1            h21dd04a_0               conda-forge
libfabric                               2.2.0            h694c41f_2               conda-forge
libfabric1                              2.2.0            h1c43f85_2               conda-forge
libffi                                  3.4.6            h281671d_1               conda-forge
libfreetype                             2.14.1           h694c41f_0               conda-forge
libfreetype6                            2.14.1           h6912278_0               conda-forge
libgfortran                             15.2.0           h306097a_1               conda-forge
libgfortran5                            15.2.0           h336fb69_1               conda-forge
libglib                                 2.86.0           h7cafd41_0               conda-forge
libhwloc                                2.12.1           default_h094e1f9_1002    conda-forge
libiconv                                1.18             h57a12c2_2               conda-forge
libintl                                 0.25.1           h3184127_1               conda-forge
libjpeg-turbo                           3.1.0            h6e16a3a_0               conda-forge
libklu                                  2.3.5            hc7f8671_7100102         conda-forge
liblapack                               3.9.0            37_h859234e_openblas     conda-forge
libllvm19                               19.1.7           h56e7563_2               conda-forge
libllvm21                               21.1.3           h56e7563_0               conda-forge
liblzma                                 5.8.1            hd471939_2               conda-forge
liblzma-devel                           5.8.1            hd471939_2               conda-forge
libnetcdf                               4.9.3            nompi_habf9e57_103       conda-forge
libnghttp2                              1.67.0           h3338091_0               conda-forge
libntlm                                 1.8              h6e16a3a_0               conda-forge
libogg                                  1.3.5            he3325bb_1               conda-forge
libopenblas                             0.3.30           openmp_h6006d49_2        conda-forge
libopenvino                             2025.2.0         h346e020_1               conda-forge
libopenvino-auto-batch-plugin           2025.2.0         heda8b29_1               conda-forge
libopenvino-auto-plugin                 2025.2.0         heda8b29_1               conda-forge
libopenvino-hetero-plugin               2025.2.0         hd57c75b_1               conda-forge
libopenvino-intel-cpu-plugin            2025.2.0         h346e020_1               conda-forge
libopenvino-ir-frontend                 2025.2.0         hd57c75b_1               conda-forge
libopenvino-onnx-frontend               2025.2.0         ha4fb624_1               conda-forge
libopenvino-paddle-frontend             2025.2.0         ha4fb624_1               conda-forge
libopenvino-pytorch-frontend            2025.2.0         hbc7d668_1               conda-forge
libopenvino-tensorflow-frontend         2025.2.0         hd87add6_1               conda-forge
libopenvino-tensorflow-lite-frontend    2025.2.0         hbc7d668_1               conda-forge
libopus                                 1.5.2            he3325bb_0               conda-forge
libpmix                                 5.0.8            h7a6afba_2               conda-forge
libpng                                  1.6.50           h84aeda2_1               conda-forge
libpq                                   18.0             h5a4e477_0               conda-forge
libprotobuf                             6.31.1           h03562ea_2               conda-forge
libptscotch                             7.0.10           int32_h4e72b04_1         conda-forge
librsvg                                 2.60.0           h2da6fc3_0               conda-forge
libscotch                               7.0.10           int32_h0c4f589_1         conda-forge
libsodium                               1.0.20           hfdf4475_0               conda-forge
libspqr                                 4.3.4            h795628b_7100102         conda-forge
libsqlite                               3.50.4           h39a8b3b_0               conda-forge
libssh2                                 1.11.1           hed3591d_0               conda-forge
libsuitesparseconfig                    7.10.1           h00e5f87_7100102         conda-forge
libtheora                               1.1.1            hfdf4475_1006            conda-forge
libtiff                                 4.7.1            haa3b502_0               conda-forge
libumfpack                              6.3.5            h0658b90_7100102         conda-forge
libusb                                  1.0.29           h2287256_0               conda-forge
libvorbis                               1.3.7            ha059160_2               conda-forge
libvpx                                  1.14.1           hf036a51_0               conda-forge
libvulkan-loader                        1.4.328.1        hfc0b2d5_0               conda-forge
libwebp-base                            1.6.0            hb807250_0               conda-forge
libxcb                                  1.17.0           hf1f96e2_0               conda-forge
libxml2                                 2.15.0           h7b7ecba_1               conda-forge
libxml2-16                              2.15.0           ha1d9b0f_1               conda-forge
libzip                                  1.11.2           h31df5bb_0               conda-forge
libzlib                                 1.3.1            hd23fc13_2               conda-forge
llvm-openmp                             21.1.3           h472b3d1_0               conda-forge
llvm-tools                              19.1.7           hb0207f0_2               conda-forge
llvm-tools-19                           19.1.7           h879f4bc_2               conda-forge
loguru                                  0.7.3            pyh707e725_0             conda-forge
lz4-c                                   1.10.0           h240833e_1               conda-forge
markdown-it-py                          4.0.0            pyhd8ed1ab_0             conda-forge
matplotlib-base                         3.10.7           py311h48d7e91_0          conda-forge
matplotlib-inline                       0.1.7            pyhd8ed1ab_1             conda-forge
mdurl                                   0.1.2            pyhd8ed1ab_1             conda-forge
meshio                                  5.3.5            pyhd8ed1ab_0             conda-forge
metis                                   5.1.0            h3023b02_1007            conda-forge
mpi                                     1.0.1            openmpi                  conda-forge
mpi4py                                  4.1.1            py311h2196963_100        conda-forge
msgpack-python                          1.1.2            py311haec20ae_0          conda-forge
multidict                               6.6.3            py311h1cc1194_0          conda-forge
mumps-include                           5.8.1            h2999806_4               conda-forge
mumps-mpi                               5.8.1            h2b2e079_4               conda-forge
munkres                                 1.1.4            pyhd8ed1ab_1             conda-forge
ncurses                                 6.5              h0622a9a_3               conda-forge
nest-asyncio                            1.6.0            pyhd8ed1ab_1             conda-forge
netcdf4                                 1.7.3            nompi_py311h56167b5_100  conda-forge
nlohmann_json                           3.12.0           h53ec75d_1               conda-forge
numpy                                   2.3.3            py311hf157cb9_0          conda-forge
openh264                                2.6.0            h4883158_0               conda-forge
openjpeg                                2.5.4            h87e8dc5_0               conda-forge
openldap                                2.6.10           hd8a590d_0               conda-forge
openmpi                                 5.0.8            h0c582a8_108             conda-forge
openssl                                 3.5.4            h230baf5_0               conda-forge
packaging                               25.0             pyh29332c3_1             conda-forge
pango                                   1.56.4           h6ef8af8_0               conda-forge
parmetis                                4.0.3            h0844cba_1007            conda-forge
parso                                   0.8.5            pyhcf101f3_0             conda-forge
pcre2                                   10.46            ha3e7e28_0               conda-forge
petsc                                   3.24.0           real_h1baac1d_2          conda-forge
petsc4py                                3.24.0           np2py310h29b8c15_0       conda-forge
pexpect                                 4.9.0            pyhd8ed1ab_1             conda-forge
pickleshare                             0.7.5            pyhd8ed1ab_1004          conda-forge
pillow                                  11.3.0           py311ha88f94d_3          conda-forge
pip                                     25.2             pyh8b19718_0             conda-forge
pixman                                  0.46.4           ha059160_1               conda-forge
pkg-config                              0.29.2           hf7e621a_1009            conda-forge
platformdirs                            4.5.0            pyhcf101f3_0             conda-forge
pooch                                   1.8.2            pyhd8ed1ab_3             conda-forge
proj                                    9.7.0            h3124640_0               conda-forge
prompt-toolkit                          3.0.52           pyha770c72_0             conda-forge
propcache                               0.3.1            py311ha3cf9ac_0          conda-forge
psutil                                  7.1.0            py311hf197a57_0          conda-forge
pthread-stubs                           0.4              h00291cd_1002            conda-forge
ptyprocess                              0.7.0            pyhd8ed1ab_1             conda-forge
pugixml                                 1.15             h46091d4_0               conda-forge
pure_eval                               0.2.3            pyhd8ed1ab_1             conda-forge
pycparser                               2.22             pyh29332c3_1             conda-forge
pygments                                2.19.2           pyhd8ed1ab_0             conda-forge
pyparsing                               3.2.5            pyhcf101f3_0             conda-forge
pysocks                                 1.7.1            pyha55dd90_7             conda-forge
python                                  3.11.14          h3999593_1_cpython       conda-forge
python-dateutil                         2.9.0.post0      pyhe01879c_2             conda-forge
python-gil                              3.11.14          hd8ed1ab_1               conda-forge
python_abi                              3.11             8_cp311                  conda-forge
pyvista                                 0.46.3           pyhd8ed1ab_1             conda-forge
pyzmq                                   27.1.0           py311h0ab6910_0          conda-forge
qhull                                   2020.2           h3c5361c_5               conda-forge
qt6-main                                6.9.3            hac9256e_0               conda-forge
readline                                8.2              h7cca4af_2               conda-forge
requests                                2.32.5           pyhd8ed1ab_0             conda-forge
rich                                    14.2.0           pyhcf101f3_0             conda-forge
scalapack                               2.2.0            hea3c4a5_4               conda-forge
scooby                                  0.10.2           pyhd8ed1ab_0             conda-forge
sdl2                                    2.32.56          h53ec75d_0               conda-forge
sdl3                                    3.2.24           h53c92ef_0               conda-forge
setuptools                              80.9.0           pyhff2d567_0             conda-forge
shaderc                                 2025.4           hda4194c_0               conda-forge
sigtool                                 0.1.3            h88f4db0_0               conda-forge
six                                     1.17.0           pyhe01879c_1             conda-forge
slepc                                   3.24.0           real_h39f6dce_1          conda-forge
slepc4py                                3.24.0           np2py310h09cc115_0       conda-forge
snappy                                  1.2.2            h25c286d_0               conda-forge
spdlog                                  1.15.3           hcdbecca_1               conda-forge
spirv-tools                             2025.4           hcb651aa_0               conda-forge
sqlite                                  3.50.4           h64b5abc_0               conda-forge
stack_data                              0.6.3            pyhd8ed1ab_1             conda-forge
superlu                                 7.0.0            h9cb3e3b_1               conda-forge
superlu_dist                            9.1.0            h5ad7ff3_0               conda-forge
svt-av1                                 3.1.2            h21dd04a_0               conda-forge
tapi                                    1300.6.5         h390ca13_0               conda-forge
tbb                                     2022.2.0         hc025b3e_1               conda-forge
tbb-devel                               2022.2.0         h1f2c84b_1               conda-forge
tk                                      8.6.13           hf689a15_2               conda-forge
tornado                                 6.5.2            py311h13e5629_1          conda-forge
traitlets                               5.14.3           pyhd8ed1ab_1             conda-forge
typing-extensions                       4.15.0           h396c80c_0               conda-forge
typing_extensions                       4.15.0           pyhcf101f3_0             conda-forge
tzdata                                  2025b            h78e105d_0               conda-forge
unicodedata2                            16.0.0           py311h13e5629_1          conda-forge
urllib3                                 2.5.0            pyhd8ed1ab_0             conda-forge
utfcpp                                  4.0.8            h694c41f_0               conda-forge
vtk                                     9.5.1            h928d209_7               conda-forge
vtk-base                                9.5.1            py311hb809fa1_7          conda-forge
vtk-io-ffmpeg                           9.5.1            h44b3099_7               conda-forge
wcwidth                                 0.2.14           pyhd8ed1ab_0             conda-forge
wheel                                   0.45.1           pyhd8ed1ab_1             conda-forge
wslink                                  2.4.0            pyhd8ed1ab_0             conda-forge
x264                                    1!164.3095       h775f41a_2               conda-forge
x265                                    3.5              hbb4e6a2_3               conda-forge
xorg-libxau                             1.0.12           h6e16a3a_0               conda-forge
xorg-libxdmcp                           1.1.5            h00291cd_0               conda-forge
yaml                                    0.2.5            h4132b18_3               conda-forge
yarl                                    1.20.1           py311ha3cf9ac_0          conda-forge
zeromq                                  4.3.5            h6c33b1e_9               conda-forge
zfp                                     1.0.1            h326e263_3               conda-forge
zipp                                    3.23.0           pyhd8ed1ab_0             conda-forge
zlib                                    1.3.1            hd23fc13_2               conda-forge
zlib-ng                                 2.2.5            he7f0fdc_0               conda-forge
zstandard                               0.25.0           py311h62e9434_0          conda-forge
zstd                                    1.5.7            h8210216_2               conda-forge

I am getting the following error once getting to the linearProblem:

Exception ignored in: <function LinearProblem.__del__ at 0x172d884a0>
Traceback (most recent call last):
  File "/Users/Hawraa_1/opt/anaconda3/envs/fenicsx-env/lib/python3.11/site-packages/dolfinx/fem/petsc.py", line 831, in __del__
    self._solver.destroy()
    ^^^^^^^^^^^^
AttributeError: 'LinearProblem' object has no attribute '_solver'
2

Could you give the full error traceback? This error usually happens whenever something else fails in the construction of LinearProblem, which shuts down the class before self._solver has been initialized. I’ve just made a PR to make this clearer with: Safer handling of PETSc destruction in high-level classes by jorgensd · Pull Request #3951 · FEniCS/dolfinx · GitHub

3

I am running the python demo with ipynb, all cells before ran with no errors until this one. Let me know if this makes it clear or if you would like me to run a separate test.

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[10], line 1
----> 1 problem = LinearProblem(
      2     a,
      3     L,
      4     bcs=[bc],
      5     petsc_options_prefix="demo_poisson_",
      6     petsc_options={"ksp_type": "preonly", "pc_type": "lu", "ksp_error_if_not_converged": True},
      7 )
      8 uh = problem.solve()
      9 assert isinstance(uh, fem.Function)

TypeError: LinearProblem.__init__() got an unexpected keyword argument 'petsc_options_prefix'
4

Remove the argument petsc_options_prefix from the LinearProblem initializer. This is a new keyword that will be mandatory in v0.10 (or currently the main branch).

5

Now I get an attribute error :

AttributeError                            Traceback (most recent call last)
Cell In[11], line 1
----> 1 problem = LinearProblem(
      2     a,
      3     L,
      4     bcs=[bc],
      5     petsc_options={"ksp_type": "preonly", "pc_type": "lu", "ksp_error_if_not_converged": True},
      6 )
      7 uh = problem.solve()
      8 assert isinstance(uh, fem.Function)

File ~/opt/anaconda3/envs/fenicsx-env/lib/python3.11/site-packages/dolfinx/fem/petsc.py:788, in LinearProblem.__init__(self, a, L, bcs, u, petsc_options, form_compiler_options, jit_options)
    754 """Initialize solver for a linear variational problem.
    755 
    756 Args:
   (...)    780                                                                "mumps"})
    781 """
    782 self._a = _create_form(
    783     a,
    784     dtype=PETSc.ScalarType,
    785     form_compiler_options=form_compiler_options,
    786     jit_options=jit_options,
    787 )
--> 788 self._A = create_matrix(self._a)
...
--> 176     return _cpp.fem.petsc.create_matrix(a._cpp_object)
    177 else:
    178     return _cpp.fem.petsc.create_matrix(a._cpp_object, mat_type)

AttributeError: 'NoneType' object has no attribute '_cpp_object'
6

Now I need your code to reproduce the example, s I don’t know what the a you are sending in is

7

running exactly the ipynb for poisson, just changed the following :

problem = LinearProblem(
    a,
    L,
    bcs=[bc],
    petsc_options={"ksp_type": "preonly", "pc_type": "lu", "ksp_error_if_not_converged": True},
)
uh = problem.solve()
assert isinstance(uh, fem.Function)
8

Could you give me a link to what Poisson demo you have downloaded? There are quite a few versions out there.

9

I used the one on here : Poisson equation — DOLFINx 0.10.0.0 documentation

10

Since you are using version 0.9, you should download it from Poisson equation — DOLFINx 0.9.0 documentation

11

yes that one works great! thank you for your assistance!