# Why do I get error with FunctionSpace on simple example? **URL:** \ **Category:** Uncategorized\ **Created:** [January 12, 2021, 8:52pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889 "2021-01-12T20:52:40Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 12, 2021, 8:52pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/1 "2021-01-12T20:52:41Z")
When I run this simple example of constructing a function space ``` from dolfin import * mesh = UnitSquareMesh(8, 8) V = FunctionSpace(mesh, "Lagrange", 1) ``` I get the following error ``` Calling FFC just-in-time (JIT) compiler, this may take some time. --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /usr/lib/python3/dist-packages/sympy/core/compatibility.py in as_int(n, strict) 418 if strict and not isinstance(n, SYMPY_INTS + (Integer,)): --> 419 raise TypeError 420 result = int(n) TypeError: During handling of the above exception, another exception occurred: ValueError Traceback (most recent call last) in 3 # Create mesh and define function space 4 mesh = UnitSquareMesh(8, 8) ----> 5 V = FunctionSpace(mesh, "Lagrange", 1) /usr/lib/petsc/lib/python3/dist-packages/dolfin/function/functionspace.py in __init__ (self, *args, **kwargs) 31 self._init_from_ufl(*args, **kwargs) 32 else: ---> 33 self._init_convenience(*args, **kwargs) 34 35 def _init_from_ufl(self, mesh, element, constrained_domain=None): /usr/lib/petsc/lib/python3/dist-packages/dolfin/function/functionspace.py in _init_convenience(self, mesh, family, degree, form_degree, constrained_domain, restriction) 98 form_degree=form_degree) 99 --> 100 self._init_from_ufl(mesh, element, constrained_domain=constrained_domain) 101 102 def dolfin_element(self): /usr/lib/petsc/lib/python3/dist-packages/dolfin/function/functionspace.py in _init_from_ufl(self, mesh, element, constrained_domain) 40 41 # Compile dofmap and element ---> 42 ufc_element, ufc_dofmap = ffc_jit(element, form_compiler_parameters=None, 43 mpi_comm=mesh.mpi_comm()) 44 ufc_element = cpp.fem.make_ufc_finite_element(ufc_element) /usr/lib/petsc/lib/python3/dist-packages/dolfin/jit/jit.py in mpi_jit(*args, **kwargs) 48 # Just call JIT compiler when running in serial 49 if MPI.size(mpi_comm) == 1: ---> 50 return local_jit(*args, **kwargs) 51 52 # Default status (0 == ok, 1 == fail) /usr/lib/petsc/lib/python3/dist-packages/dolfin/jit/jit.py in ffc_jit(ufl_form, form_compiler_parameters) 98 p.update(dict(parameters["form_compiler"])) 99 p.update(form_compiler_parameters or {}) --> 100 return ffc.jit(ufl_form, parameters=p) 101 102 /usr/lib/python3/dist-packages/ffc/jitcompiler.py in jit(ufl_object, parameters, indirect) 215 216 # Inspect cache and generate+build if necessary --> 217 module = jit_build(ufl_object, module_name, parameters) 218 219 # Raise exception on failure to build or import module /usr/lib/python3/dist-packages/ffc/jitcompiler.py in jit_build(ufl_object, module_name, parameters) 128 129 # Carry out jit compilation, calling jit_generate only if needed --> 130 module, signature = dijitso.jit(jitable=ufl_object, 131 name=module_name, 132 params=params, /usr/lib/python3/dist-packages/dijitso/jit.py in jit(jitable, name, params, generate, send, receive, wait) 163 elif generate: 164 # 1) Generate source code --> 165 header, source, dependencies = generate(jitable, name, signature, params["generator"]) 166 # Ensure we got unicode from generate 167 header = as_unicode(header) /usr/lib/python3/dist-packages/ffc/jitcompiler.py in jit_generate(ufl_object, module_name, signature, parameters) 63 compile_object = compile_coordinate_mapping 64 ---> 65 code_h, code_c, dependent_ufl_objects = compile_object(ufl_object, 66 prefix=module_name, parameters=parameters, jit=True) 67 /usr/lib/python3/dist-packages/ffc/compiler.py in compile_element(elements, object_names, prefix, parameters, jit) 147 prefix="Element", parameters=None, jit=False): 148 """This function generates UFC code for a given UFL element or list of UFL elements.""" --> 149 return compile_ufl_objects(elements, "element", object_names, 150 prefix, parameters, jit) 151 /usr/lib/python3/dist-packages/ffc/compiler.py in compile_ufl_objects(ufl_objects, kind, object_names, prefix, parameters, jit) 188 # Stage 2: intermediate representation 189 cpu_time = time() --> 190 ir = compute_ir(analysis, prefix, parameters, jit) 191 _print_timing(2, time() - cpu_time) 192 /usr/lib/python3/dist-packages/ffc/representation.py in compute_ir(analysis, prefix, parameters, jit) 165 # Compute representation of elements 166 info("Computing representation of %d elements" % len(elements)) --> 167 ir_elements = [_compute_element_ir(e, element_numbers, classnames, parameters, jit) 168 for e in elements] 169 /usr/lib/python3/dist-packages/ffc/representation.py in (.0) 165 # Compute representation of elements 166 info("Computing representation of %d elements" % len(elements)) --> 167 ir_elements = [_compute_element_ir(e, element_numbers, classnames, parameters, jit) 168 for e in elements] 169 /usr/lib/python3/dist-packages/ffc/representation.py in _compute_element_ir(ufl_element, element_numbers, classnames, parameters, jit) 198 199 # Create FIAT element --> 200 fiat_element = create_element(ufl_element) 201 cell = ufl_element.cell() 202 cellname = cell.cellname() /usr/lib/python3/dist-packages/ffc/fiatinterface.py in create_element(ufl_element) 98 # Create regular FIAT finite element 99 if isinstance(ufl_element, ufl.FiniteElement): --> 100 element = _create_fiat_element(ufl_element) 101 102 # Create mixed element (implemented by FFC) /usr/lib/python3/dist-packages/ffc/fiatinterface.py in _create_fiat_element(ufl_element) 196 element = ElementClass(fiat_cell) 197 else: --> 198 element = ElementClass(fiat_cell, degree) 199 200 # Consistency check between UFL and FIAT elements. /usr/lib/python3/dist-packages/FIAT/lagrange.py in __init__ (self, ref_el, degree) 41 42 def __init__ (self, ref_el, degree): ---> 43 poly_set = polynomial_set.ONPolynomialSet(ref_el, degree) 44 dual = LagrangeDualSet(ref_el, degree) 45 formdegree = 0 # 0-form /usr/lib/python3/dist-packages/FIAT/polynomial_set.py in __init__ (self, ref_el, degree, shape) 166 vinv = numpy.linalg.inv(v) 167 --> 168 dv = expansion_set.tabulate_derivatives(degree, pts) 169 dtildes = [[[a[1][i] for a in dvrow] for dvrow in dv] 170 for i in range(sd)] /usr/lib/python3/dist-packages/FIAT/expansions.py in tabulate_derivatives(self, n, pts) 275 def tabulate_derivatives(self, n, pts): 276 order = 1 --> 277 data = _tabulate_dpts(self._tabulate, 2, n, order, numpy.array(pts)) 278 # Put data in the required data structure, i.e., 279 # k-tuples which contain the value, and the k-1 derivatives /usr/lib/python3/dist-packages/FIAT/expansions.py in _tabulate_dpts(tabulator, D, n, order, pts) 72 73 # Tabulate symbolically ---> 74 symbolic_tab = tabulator(n, X) 75 # Make sure that the entries of symbolic_tab are lists so we can 76 # append derivatives /usr/lib/python3/dist-packages/FIAT/expansions.py in _tabulate(self, n, pts) 243 y = ref_pts[1] 244 --> 245 f1 = (1.0 + 2 * x + y) / 2.0 246 f2 = (1.0 - y) / 2.0 247 f3 = f2**2 /usr/lib/python3/dist-packages/sympy/core/decorators.py in __sympifyit_wrapper(a, b) 89 if not hasattr(b, '_op_priority'): 90 b = sympify(b, strict=True) ---> 91 return func(a, b) 92 except SympifyError: 93 return retval /usr/lib/python3/dist-packages/sympy/core/decorators.py in binary_op_wrapper(self, other) 127 if f is not None: 128 return f(self) --> 129 return func(self, other) 130 return binary_op_wrapper 131 return priority_decorator /usr/lib/python3/dist-packages/sympy/core/expr.py in __rmul__ (self, other) 199 @call_highest_priority(' __mul__') 200 def __rmul__ (self, other): --> 201 return Mul(other, self) 202 203 @_sympifyit('other', NotImplemented) /usr/lib/python3/dist-packages/sympy/core/cache.py in wrapper(*args, **kwargs) 92 def wrapper(*args, **kwargs): 93 try: ---> 94 retval = cfunc(*args, **kwargs) 95 except TypeError: 96 retval = func(*args, **kwargs) /usr/lib/python3/dist-packages/sympy/core/operations.py in __new__ (cls, *args, **options) 45 return args[0] 46 ---> 47 c_part, nc_part, order_symbols = cls.flatten(args) 48 is_commutative = not nc_part 49 obj = cls._from_args(c_part + nc_part, is_commutative) /usr/lib/python3/dist-packages/sympy/core/mul.py in flatten(cls, seq) 205 elif global_distribute[0] and b.is_commutative: 206 r, b = b.as_coeff_Add() --> 207 bargs = [_keep_coeff(a, bi) for bi in Add.make_args(b)] 208 _addsort(bargs) 209 ar = a*r /usr/lib/python3/dist-packages/sympy/core/mul.py in (.0) 205 elif global_distribute[0] and b.is_commutative: 206 r, b = b.as_coeff_Add() --> 207 bargs = [_keep_coeff(a, bi) for bi in Add.make_args(b)] 208 _addsort(bargs) 209 ar = a*r /usr/lib/python3/dist-packages/sympy/core/mul.py in _keep_coeff(coeff, factors, clear, sign) 1895 if margs[0].is_Number: 1896 margs[0] *= coeff -> 1897 if margs[0] == 1: 1898 margs.pop(0) 1899 else: /usr/lib/python3/dist-packages/sympy/core/numbers.py in __eq__ (self, other) 1404 return self._mpf_ == other._mpf_ 1405 if other.is_Rational: -> 1406 return other. __eq__ (self) 1407 if other.is_Number: 1408 # numbers should compare at the same precision; /usr/lib/python3/dist-packages/sympy/core/numbers.py in __eq__ (self, other) 2246 elif isinstance(other, Integer): 2247 return (self.p == other.p) -> 2248 return Rational. __eq__ (self, other) 2249 2250 def __ne__ (self, other): /usr/lib/python3/dist-packages/sympy/core/numbers.py in __eq__ (self, other) 1904 # does m*2**t == self.p 1905 return self.p and not self.p % m and \ -> 1906 integer_log(self.p//m, 2) == (t, True) 1907 # does non-integer s*m/2**-t = p/q? 1908 if self.is_Integer: /usr/lib/python3/dist-packages/sympy/core/power.py in integer_log(y, x) 145 if x in (-2, 2): 146 x = int(x) --> 147 y = as_int(y) 148 e = y.bit_length() - 1 149 return e, x**e == y /usr/lib/python3/dist-packages/sympy/core/compatibility.py in as_int(n, strict) 423 return result 424 except TypeError: --> 425 raise ValueError('%s is not an integer' % (n,)) 426 427 ValueError: 1 is not an integer ``` ​ I am using Ubuntu with Python 3.8.5. I installed FEniCS as instructed on the FEniCS website: ``` sudo apt-get install software-properties-common sudo add-apt-repository ppa:fenics-packages/fenics sudo apt-get update sudo apt-get install --no-install-recommends fenics ``` ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [January 12, 2021, 9:50pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/2 "2021-01-12T21:50:20Z")
I cannot reproduce with the following (using docker based on ubuntu 20.04): ```auto docker run -ti --rm -v $PWD:/home/shared -w /home/shared ubuntu:20.04 apt-get update apt-get install sudo sudo apt-get install software-properties-common sudo add-apt-repository ppa:fenics-packages/fenics sudo apt-get update sudo apt-get install --no-install-recommends fenics ``` Starting the docker container, running the commands above, I’m able to run your script without errors. I guess it is the version on sympy on your system that is old (ref: [Strange behavior of: as\_int TypeError · Issue #20615 · sympy/sympy · GitHub](https://github.com/sympy/sympy/issues/20615)). Could you check your sympy version? Running: ```auto python3 -c "import sympy ; print(sympy. __version__ )" ``` yields ```auto 1.5.1 ``` for me ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 12, 2021, 10:14pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/3 "2021-01-12T22:14:43Z")
Thanks for your reply. I also get 1.5.1 ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [January 12, 2021, 10:35pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/4 "2021-01-12T22:35:41Z")
Are you using ubuntu 20.04? ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 12, 2021, 10:50pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/5 "2021-01-12T22:50:59Z")
Yes, it says Ubuntu 20.04.1 LTS ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [January 12, 2021, 11:08pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/6 "2021-01-12T23:08:47Z")
Thats really strange then. Could you Give me the result of `pip3 list`? ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 12, 2021, 11:24pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/7 "2021-01-12T23:24:57Z")
``` Package Version ---------------------- -------------------- alabaster 0.7.8 appdirs 1.4.3 apptools 4.5.0 apturl 0.5.2 asn1crypto 0.24.0 astroid 2.3.3 atomicwrites 1.1.5 attrs 19.3.0 autobahn 17.10.1 autokey 0.95.10 Automat 0.8.0 Babel 2.6.0 backcall 0.1.0 basemap 1.2.1 bcrypt 3.1.7 bleach 3.1.1 blinker 1.4 breezy 3.0.2 brial 1.0.2 Brlapi 0.7.0 cbor 1.0.0 ccsm 0.9.14.1 certifi 2019.11.28 chardet 3.0.4 chrome-gnome-shell 0.0.0 Click 7.0 cloudpickle 1.3.0 colorama 0.4.3 command-not-found 0.3 compizconfig-python 0.9.14.1 configobj 5.0.6 constantly 15.1.0 cryptography 2.8 cssutils 1.0.2 cupshelpers 1.0 cvxopt 1.2.3 cycler 0.10.0 cypari2 2.1.1 Cython 0.29.14 dbus-python 1.2.16 decorator 4.4.2 defer 1.0.6 defusedxml 0.6.0 Deprecated 1.2.7 devscripts 2.20.2ubuntu2 distlib 0.3.0 distro 1.4.0 distro-info 0.23ubuntu1 docutils 0.16 dot2tex 2.11.3 dulwich 0.19.15 duplicity 0.8.12.0 entrypoints 0.3 envisage 4.9.0 et-xmlfile 1.0.1 fasteners 0.14.1 fastimport 0.9.8 feedparser 5.2.1 fenics-dijitso 2019.2.0.dev0 fenics-dolfin 2019.2.0.dev0 fenics-ffc 2019.2.0.dev0 fenics-fiat 2019.2.0.dev0 fenics-ufl 2019.2.0.dev0 filelock 3.0.12 flake8 3.7.9 fpylll 0.5.1.dev0 future 0.18.2 gajim 1.1.3 GDAL 3.0.4 geographiclib 1.50 geopy 1.20.0 gmpy2 2.1.0b3 gpg 1.13.1-unknown h5py 2.10.0 html5lib 1.0.1 httplib2 0.14.0 hyperlink 19.0.0 idna 2.8 imagesize 1.2.0 importlib-metadata 1.5.0 incremental 16.10.1 iotop 0.6 ipykernel 5.2.0 ipython 7.13.0 ipython-genutils 0.2.0 isodate 0.6.0 isort 4.3.4 itsdangerous 1.1.0 jdcal 1.0 jedi 0.15.2 Jinja2 2.10.1 joblib 0.14.0 jsonschema 3.2.0 jupyter-client 6.1.2 jupyter-core 4.6.3 keyring 18.0.1 keyrings.alt 3.4.0 kiwisolver 1.0.1 language-selector 0.1 launchpadlib 1.10.13 lazr.restfulclient 0.14.2 lazr.uri 1.0.3 lazy-object-proxy 1.4.3 libvirt-python 6.1.0 lockfile 0.12.2 logilab-common 1.4.3 louis 3.12.0 lxml 4.5.0 lz4 3.0.2+dfsg macaroonbakery 1.3.1 Mako 1.1.0 MarkupSafe 1.1.0 matplotlib 3.1.2 mayavi 4.7.1 mccabe 0.6.1 meld 3.20.2 meshio 4.0.4 mistune 0.8.4 mock 3.0.5 monotonic 1.5 more-itertools 4.2.0 mpi4py 3.0.3 mpmath 1.1.0 mshr 2019.2.0.dev0 musicbrainzngs 0.7.1 mutagen 1.44.0 nbconvert 5.6.1 nbformat 5.0.4 nbxmpp 0.6.10 netifaces 0.10.4 networkx 2.4 nose 1.3.7 notebook 6.0.3 numexpr 2.7.1 numpy 1.17.4 numpydoc 0.7.0 oauth 1.0.1 oauthlib 3.1.0 olefile 0.46 openpyxl 3.0.3 openshot-qt 2.4.3 OWSLib 0.19.1 packaging 20.3 pandas 0.25.3 pandocfilters 1.4.2 paramiko 2.6.0 parso 0.5.2 path.py 12.0.1 pbr 5.4.5 pdfarranger 1.4.2 petsc4py 3.12.0 petsc4py-real 3.12.0 pexpect 4.6.0 pickleshare 0.7.5 pikepdf 1.10.3+dfsg Pillow 7.0.0 pip 20.0.2 Pivy 0.6.5 pkgconfig 1.5.1 plotly 4.4.1 pluggy 0.13.0 ply 3.11 pplpy 0.8.4 precis-i18n 1.0.0 prometheus-client 0.7.1 prompt-toolkit 2.0.10 protobuf 3.6.1 psutil 5.5.1 psycopg2 2.8.4 PuLP 1.6.0 py 1.8.1 py-ubjson 0.14.0 pyasn1 0.4.2 pyasn1-modules 0.2.1 pybind11 2.4.3 pycairo 1.16.2 pycodestyle 2.5.0 pycrypto 2.6.1 pycups 1.9.73 pyface 6.1.2 pyflakes 2.1.1 PyGithub 1.43.7 Pygments 2.3.1 PyGObject 3.36.0 PyHamcrest 1.9.0 pyinotify 0.9.6 PyJWT 1.7.1 pylibacl 0.5.4 pylint 2.4.4 pymacaroons 0.13.0 PyNaCl 1.3.0 pyOpenSSL 19.0.0 pyparsing 2.4.6 PyPDF2 1.26.0 pypng 0.0.20 pyproj 2.5.0 PyQRCode 1.2.1 PyQt5 5.14.1 pyRFC3339 1.1 pyrsistent 0.15.5 pyshp 2.1.0 PyStemmer 1.3.0 pysvn 1.9.9 pytest 4.6.9 python-apt 2.0.0+ubuntu0.20.4.3 python-dateutil 2.7.3 python-debian 0.1.36ubuntu1 python-gitlab 2.0.1 python-libdiscid 1.0 python-pam 1.8.4 python-snappy 0.5.3 python-xapp 1.8.1 python-xlib 0.23 python3-openid 3.1.0 PyTrie 0.2 pytz 2019.3 pyxattr 0.6.1 pyxdg 0.26 PyYAML 5.3.1 pyzmq 18.1.1 qrcode 6.1 QtAwesome 0.4.4 qtconsole 4.6.0 QtPy 1.9.0 quodlibet 4.2.1 rdflib 4.2.2 rdiff-backup 2.0.0 reportlab 3.5.34 requests 2.22.0 requests-unixsocket 0.2.0 retrying 1.3.3 roman 2.0.0 rope 0.10.5 rpy2 3.3.5 rubber 1.5.1 sage 9.0 sagenb-export 3.2 scikit-learn 0.22.2.post1 scipy 1.3.3 seaborn 0.10.0 SecretStorage 2.3.1 Send2Trash 1.5.0 service-identity 18.1.0 setproctitle 1.1.10 setuptools 45.2.0 setuptools-scm 3.4.3 simplegeneric 0.8.1 simplejson 3.16.0 sip 4.19.21 six 1.14.0 slepc4py 3.12.0 slepc4py-real 3.12.0 snowballstemmer 2.0.0 Sphinx 1.8.5 spyder 3.3.6 spyder-kernels 0.5.2 ssh-import-id 5.10 sympy 1.5.1 system-service 0.3 systemd-python 234 tables 3.6.1 terminado 0.8.2 testpath 0.4.4 tinycss 0.4 toml 0.10.0 tornado 5.1.1 traitlets 4.3.3 traits 5.2.0 traitsui 6.1.3 Twisted 18.9.0 txaio 2.10.0 tzlocal 2.1b1 u-msgpack-python 2.1 ubuntu-advantage-tools 20.3 ubuntu-drivers-common 0.0.0 ufw 0.36 unattended-upgrades 0.1 unity-tweak-tool 0.0.7 urllib3 1.25.8 usb-creator 0.3.7 vcversioner 2.16.0.0 virtualenv 20.0.17 wadllib 1.3.3 wcwidth 0.1.8 webencodings 0.5.1 Werkzeug 0.16.1 wheel 0.34.2 wrapt 1.11.2 wsaccel 0.6.2 xkit 0.0.0 xlrd 1.1.0 xlwt 1.3.0 zipp 1.0.0 zope.interface 4.7.1 ``` ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 13, 2021, 10:48am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/8 "2021-01-13T10:48:24Z")
I also have Firedrake installed although that’s in a venv. Could that be causing problems? ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [January 13, 2021, 10:52am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/9 "2021-01-13T10:52:04Z")
Quite hard to tell. As I couldn’t reproduce the error with docker in the post above, it indicatest that something is clashing with dolfin. Have you ever tried using docker (as I showed above, the code works fine there, and there exists prebuilt images, such as: `quay.io/fenicsproject/dev:latest` that is ready to work without any installation ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 13, 2021, 11:01am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/10 "2021-01-13T11:01:59Z")
I haven’t used Docker. I’ll try that, thanks. ---
**Author:** ![cweickhmann](https://avatars.discourse-cdn.com/v4/letter/c/bc79bd/32.png) [@cweickhmann](https://fenicsproject.discourse.group/u/cweickhmann)\ **Post date:** [January 14, 2021, 10:30am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/11 "2021-01-14T10:30:06Z")
From the looks of it, I’d suspect a package clash indeed: Have you noticed the different paths in the backtrace? > [@sophiea](#): > > `/usr/lib/petsc/lib/python3/dist-packages/dolfin/jit/jit.py` > … > `/usr/lib/python3/dist-packages/ffc/jitcompiler.py` Does this still happen if you do not import dolfin globally? I.e. ```python import dolfin as do mesh = do.UnitSquareMesh(8, 8) V = do.FunctionSpace(mesh, "Lagrange", 1) ``` ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 14, 2021, 10:53am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/12 "2021-01-14T10:53:27Z")
Thanks for your reply. Yes I still get the error when I import dolfin in that way (not globally). Do you know how I can resolve a package clash? ---
**Author:** ![cweickhmann](https://avatars.discourse-cdn.com/v4/letter/c/bc79bd/32.png) [@cweickhmann](https://fenicsproject.discourse.group/u/cweickhmann)\ **Post date:** [January 20, 2021, 2:59pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/13 "2021-01-20T14:59:34Z")
Hard to judge remotely. I’d say try the Docker image. ---
**Author:** ![helenzha](https://avatars.discourse-cdn.com/v4/letter/h/b19c9b/32.png) [@helenzha](https://fenicsproject.discourse.group/u/helenzha)\ **Post date:** [January 23, 2021, 6:14pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/14 "2021-01-23T18:14:33Z")
Hello, I have the same problem. Did you have any luck using docker? ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 25, 2021, 10:52am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/15 "2021-01-25T10:52:39Z")
I actually didn’t try it yet sorry. I’m using Firedrake instead for now as my colleague is familiar with it so can help me. ---
**Author:** ![helenzha](https://avatars.discourse-cdn.com/v4/letter/h/b19c9b/32.png) [@helenzha](https://fenicsproject.discourse.group/u/helenzha)\ **Post date:** [January 25, 2021, 2:00pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/16 "2021-01-25T14:00:27Z")
I was told to try updating sympy: python3 -m pip install sympy==1.6 and it’s fixed the issue. ---
**Author:** ![sophiea](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sophiea](https://fenicsproject.discourse.group/u/sophiea)\ **Post date:** [January 25, 2021, 2:17pm UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/17 "2021-01-25T14:17:44Z")
This worked for me too! Thanks so much! ---
**Author:** ![Mahendranath](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/mahendranath/32/2441_2.png) [@Mahendranath](https://fenicsproject.discourse.group/u/Mahendranath)\ **Post date:** [April 27, 2021, 10:04am UTC](https://fenicsproject.discourse.group/t/why-do-i-get-error-with-functionspace-on-simple-example/4889/18 "2021-04-27T10:04:51Z")
This worked for me also. Thanks.