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Problem with adding a movie clip

I’ve just started my adventure with PsychoPy so I may have overlooked something really obvious.The problem is that when I add a clip, I can’t run the experiment. With text stimulus everything works perfectly, when I add a picture or a movie, I just see a grey screen for a second and the experiment is over. Could you help me fix the problem?

What specifically went wrong when you tried that?:
Include pasted full error message if possible. “That didn’t work” is not enough information.