Py file works - exe doesn't

[GoogleMe]

I made a little script with python 2.7 that receive connections from clients and i found a way finaly to encrypt everything with AES-256 bit.. ( the scripts should work as usual )

The encrypted file worked well in idle/pycharm but when i tried to convert it to exe with pyinstaller i got an error relates to ntpath.py

Object type NoneType has no len()..

And it refused to create the file i tried many version of pyinstaller is there anything else i need to install(c++ compiler / pywin32 ..) 

pyinstaller works i tried to convert something that does not have crypto inside and it worked i think its about the cryptography that refused to make it executable

Any help?