TypeError: unorderable types: str() < NoneType()

[raghavgurbaxani]

After training the part 1 file for 50 epochs...

In 2. O'Reilly Generate.ipynb, I get this error

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File "/mnt/a/sw/xe_xk_cle5.2UP02_pe2.3.0/bwpy/0.3.0/python-single/usr/lib/python3.4/site-packages/sitecustomize.d/syslog-imports.py", line 101, in master_log_imports
log_imports()
File "/mnt/a/sw/xe_xk_cle5.2UP02_pe2.3.0/bwpy/0.3.0/python-single/usr/lib/python3.4/site-packages/sitecustomize.d/syslog-imports.py", line 40, in wrapper
function(*args, **kwargs)
File "/mnt/a/sw/xe_xk_cle5.2UP02_pe2.3.0/bwpy/0.3.0/python-single/usr/lib/python3.4/site-packages/sitecustomize.d/syslog-imports.py", line 84, in log_imports
modulelist = ', '.join(list(impts))
File "/mnt/a/sw/xe_xk_cle5.2UP02_pe2.3.0/bwpy/0.3.0/python-single/usr/lib/python3.4/site-packages/sitecustomize.d/syslog-imports.py", line 60, in imports
if in_prefix(val.file):
File "/mnt/a/sw/xe_xk_cle5.2UP02_pe2.3.0/bwpy/0.3.0/python-single/usr/lib/python3.4/site-packages/sitecustomize.d/syslog-imports.py", line 51, in in_prefix
if len(os.path.commonprefix([file, s])) > 1:
File "/sw/bw/bwpy/0.3.0/python-single//usr/lib/python-exec/python3.4/../../../lib/python3.4/genericpath.py", line 72, in commonprefix
s1 = min(m)
TypeError: unorderable types: str() < NoneType()