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Problem when i run a demo

when i try to play a demos experiment it doesn’t work. appear the message below
Traceback (most recent call last):
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py”, line 1155, in demoLoad
fileDir = self.demos[event.GetId()]
KeyError: -31588

how can i resolve this?