ModuleNotFoundError: No module named '_common'

[Divyat Mahajan]

I want to install the fenics version 2017.1.0. I used the following command to install it with conda: 

conda install -c conda-forge fenics=2017.1.0

But after installation, import fenics led to the following error:

  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/dolfin/cpp/common.py", line 18, in swig_import_helper
    return importlib.import_module(mname)
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 658, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 571, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 922, in create_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
ImportError: libcholmod.so.3: cannot open shared object file: No such file or directory


During handling of the above exception, another exception occurred:


Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/fenics/__init__.py", line 7, in <module>
    from dolfin import *
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/dolfin/__init__.py", line 17, in <module>
    from . import cpp
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/dolfin/cpp/__init__.py", line 43, in <module>
    exec("from . import %s" % module_name)
  File "<string>", line 1, in <module>
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/dolfin/cpp/common.py", line 21, in <module>
    _common = swig_import_helper()
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/site-packages/dolfin/cpp/common.py", line 20, in swig_import_helper
    return importlib.import_module('_common')
  File "/scratch/work/mahajad1/fenicselfi/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named '_common'

It seems to be a common error, many issues on Git regarding it but I could not solve it using those references. 

[Johannes Ring]

Try to install suitesparse and see if that helps:

  conda install -c conda-forge suitesparse

Johannes

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[Divyat Mahajan]

Thanks, it worked for me.

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