Installation problem: ImportError: No module named _weakrefset

pyCharm installed w/o errors (on Linux Mint) and the initial session (config etc.) was error-free. However subsequent calls to result in the following error:

Traceback (most recent call last):
  File "/usr/lib/python2.7/", line 68, in <module>
    import os
  File "/usr/lib/python2.7/", line 398, in <module>
    import UserDict
  File "/usr/lib/python2.7/", line 83, in <module>
    import _abcoll
  File "/usr/lib/python2.7/", line 11, in <module>
    from abc import ABCMeta, abstractmethod
  File "/usr/lib/python2.7/", line 8, in <module>
    from _weakrefset import WeakSet
ImportError: No module named _weakrefset

My system is up-to-date and python-virtualenv is installed.
Can anyone give me a tip how to resolve this error?

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