If somebody have an idea...
If you are referring to this;
Code
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f61c4ee5510>
Traceback (most recent call last):
File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7f61c4ee5510>
Traceback (most recent call last):
File "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
ignore it, search the forum it comes up quite a lot.