Traceback (most recent call last):


 "C:\Users\adnan\AppData\Local\Programs\Python\Python38-32\lib\site-packages\tornado\ioloop.py", line 907, in _run

return self.callback()


 "C:\Users\adnan\AppData\Local\Programs\Python\Python38-32\lib\site-packages\distributed\nanny.py", line 414, in memory_monitor

process = self.process.process
AttributeError: 'NoneType' object has no attribute 'process'

Traceback (most recent call last):


 "/Users/ultimaker/build/2.7/build/inst/lib/python3.5/site-packages/cura/CuraApplication.py", line 707, in event


 "/Users/ultimaker/build/2.7/build/inst/lib/python3.5/site-packages/UM/Qt/QtApplication.py", line 261, in event


 "/Users/ultimaker/build/2.7/build/inst/lib/python3.5/site-packages/UM/Event.py", line 189, in call


 "/Users/ultimaker/build/2.7/build/inst/lib/python3.5/site-packages/UM/Signal.py", line 315, in __performEmit


 "/Users/ultimaker/build/2.7/build/inst/lib/python3.5/site-packages/cura/Settings/ExtruderStack.py", line 94, in _onPropertiesChanged
AttributeError: 'NoneType' object has no attribute 'definition'
