I am very new to this! I am using MacOS Catalina 10.15.4 and PsychoPy3 v2020 2.4.
My demo of Stroop won’t run! I used the builder and I also downloaded N-back from an online project - that doesn’t run either. I get the error message shown below and the program won’t shut down.
I’d greatly appreciate some pointers!
Traceback (most recent call last):
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.6/psychopy/app/runner/scriptProcess.py”, line 118, in whileRunningFile
AttributeError: ‘NoneType’ object has no attribute ‘poll’