"Segmentation fault: 11" when importing json

[nbro]

I am getting the famous "Segmentation fault: 11" error while importing json in the file nupic_history/io_client.py, whose corresponding module is indirectly imported from the webserver.py script, when importing NupicHistory (i.e. from nupic_history import NupicHistory). The strangest things are that json is a standard Python module and I can import it from an interactive Python shell without getting this error. The json module is not even used in nupic_history/io_client.py, so I commented that import statement. But I am getting another error now, but it's related to the import statement import capnp in that same file nupic_history/io_client.py (See this issue).

Of course, I have looked for a solution on the web, but I didn't really find something similar. I just wanted to let you know about this strange behavior. I'm on a Mac OS X, version 10.13.6, and I am using Python 2.7.15 in a virtual environment.

[rhyolight]

See: numenta/nupic-legacy#3851