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Online - Movie Setting Error

URL of experiment: Pavlovia

Description of the problem:
When piloting the experiment, the error shown in the screenshot below occurs.
My video is .avi format. Not sure where to start with fixing this!

So I have switched to .mp4 formats, and Pavlovia seems to prefer them - it doesn’t freeze and spit out the gobbledigook like before.
However, it is still having an issue with the source of the videos. The experiment runs fine in Builder.
I get the following error message - I’ve included the console too if it’s useful.