Why is it showing unknown file i/o error every time I try to edit something in my composition?

http://gyazo.com/fc83fa265ee7f024a59dde0ee745cb3e Screen shot. Any help?

If these are gaming clips from a screen capture program then the recording format is not compatible with AE. You'll have to transcode them to a suitable production codec. If you are just editing then you should use a NLE, if you need to composite or do other motion graphics to your game capture footage then AE may be the right app to be using.

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