Traceback (most recent call last):


 "/usr/lib/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable

Traceback (most recent call last):

 "C:\Users\jameswang\anaconda3\envs\sklearn\lib\site-packages\spyder\widgets\browser.py", line 332, in contextMenuEvent
self.context_menu.popup(event.globalPos())AttributeError: 'NoneType' object has no attribute 'popup'