python3 ontobio/io/differ.py --file1 /tmp/noctua_mgi-src.gpad --file2 /tmp/noctua_mgi-src.gpad --output /tmp/test.b.out --group_by_column DB_Object_ID --group_by_column Evidence_type

traceback.txt

(env) sjcarbon@moiraine:~/local/src/git/ontobio[gpad_differ]$:( python3 ontobio/io/differ.py --file1 /tmp/noctua_mgi-src.gpad --file2 /tmp/noctua_mgi-src.gpad --output /tmp/test.b.out --group_by_column DB_Object_ID --group_by_column Evidence_type
/home/sjcarbon/local/src/git/ontobio/env/lib/python3.7/site-packages/rdflib_jsonld/__init__.py:12: DeprecationWarning: The rdflib-jsonld package has been integrated into rdflib as of rdflib==6.0.1.  Please remove rdflib-jsonld from your project's dependencies.
  DeprecationWarning,
Traceback (most recent call last):
  File "ontobio/io/differ.py", line 354, in <module>
    compare_files()
  File "/home/sjcarbon/local/src/git/ontobio/env/lib/python3.7/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/home/sjcarbon/local/src/git/ontobio/env/lib/python3.7/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/home/sjcarbon/local/src/git/ontobio/env/lib/python3.7/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/sjcarbon/local/src/git/ontobio/env/lib/python3.7/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "ontobio/io/differ.py", line 45, in compare_files
    df_file1, df_file2, assocs1, assocs2 = get_parser(file1, file2)
  File "ontobio/io/differ.py", line 198, in get_parser
    df_file1, parser1 = get_typed_parser(file1_obj, file1)
  File "ontobio/io/differ.py", line 181, in get_typed_parser
    df_file = read_gpad_csv(filename, parser.version)
  File "ontobio/io/differ.py", line 243, in read_gpad_csv
    if version.startswith("1"):
AttributeError: 'NoneType' object has no attribute 'startswith'