Error when running experiment

Builder
1

I have recently downloaded PsychoPy and am using for the first time. I created a very simple experiment and upon trying to run it I get the following error message:

Traceback (most recent call last):
File “/Applications/PsychoPy.app/Contents/Resources/boot.py”, line 197, in
File “/Applications/PsychoPy.app/Contents/Resources/boot.py”, line 166, in _run
File “/Applications/PsychoPy.app/Contents/Resources/psychopyApp.py”, line 102, in
File “/Applications/PsychoPy.app/Contents/Resources/psychopyApp.py”, line 98, in main
File “/Applications/PsychoPy.app/Contents/Resources/psychopyApp.py”, line 27, in start_app
AttributeError: ‘NoneType’ object has no attribute ‘MainLoop’

After this the application quits. Can anyone help?

2

Does your experiment contain any loops? If not, try adding one around your first routine. It can have 1 repetition and no spreadsheet.

What version of PsychoPy are you using?