Errors in calling `from fenics import *`

installation
1

Hello, everyone,

I use the macOS Mojave (10.14.5) system, and install the Anaconda.

Then I install the Fenics by
conda create -n fenicsproject -c conda-forge fenics.

Finally, I install the Fenics successfully.

And I do source activate fenicsproject, then in the Python 3.7.3 environment, when I call from fenics import *, I get the following errors:

(fenicsproject) MacBookPro:~ xxx$ python
Python 3.7.3 | packaged by conda-forge | (default, Jul  1 2019, 14:38:56) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> from fenics import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Applications/anaconda3/envs/fenicsproject/lib/python3.7/site-packages/fenics/__init__.py", line 7, in <module>
    from dolfin import *
  File "/Applications/anaconda3/envs/fenicsproject/lib/python3.7/site-packages/dolfin/__init__.py", line 34, in <module>
    from .cpp import __version__
ImportError: dlopen(/Applications/anaconda3/envs/fenicsproject/lib/python3.7/site-packages/dolfin/cpp.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libdmumps-5.1.2.dylib
  Referenced from: /Applications/anaconda3/envs/fenicsproject/lib/libpetsc.3.11.dylib
  Reason: image not found

Thanks.

2

Try this:

conda create -n fenics2018 -c conda-forge fenics=2018

This worked for me (macOS Mojave 10.14.6), what did not work was fenics=2019. You can also try fenics=2017 but then I would suggest using

conda create -n fenics2017 -c conda-forge fenics=2017 scipy matplotlib=2.2.3 python=3.5 mpi4py sympy=1.1.1

Actually, I use:

conda create -n fenics2018 -c conda-forge fenics=2018 matplotlib scipy python=3.7 sympy spyder jupyter

and if you also want spyder and jupyter, then I had to reset spyder (the first time I opened spyder it crashed and said that I have to reset it. Then it worked). For jupyter I also had to install nb_conda:

conda install nb_conda

Hope this works for you.

edit: I also tried to launch Anaconda, changed the environment there and selected Spyder, this did not work for me. Uninstalled everything and installed miniconda

3

Note from the Changelog of 2018.1.0

Removed from fenics import * , use from dolfin import *

4 
Removed from fenics import * , use from dolfin import *

This change was reverted since it was too disruptive. You can see in yoczhang’s output that fenics import calls dolfin import. The problem seems to be the mumps library. @yoczhang, check your installation of mumps 5.1.2.

5

Yes, I have installed mumps 5.1.2. But it has the above-mentioned errors.

6

Ok, thanks, I will try this.