I followed directions in using_EasyABC_in_Linux.txt . When I try to start it with "python3 easy_abc.py", , I get a Traceback that ends, ../EasyABC/pyparsing.py", line 943, in <module> collections.MutableMapping.register(ParseResults) AttributeError: module 'collections' has no attribute 'MutableMapping'</module> I tried moving pyparsing.py to the "not used" folder, and got a worse-looking collection of errors. So I moved it back. Any ideas?