When I'm trying to export in any other type file from avi, it tells that there was an error while encoding. I tried to use QuickTime - same. Is there a way to fix it?

Hello ? are you exporting from a flipbook ?
Most of the time when i export a flipbook in mp4 i take care to have even value in pixels
like if you got something like 947x845 pixels just change it to 948x846 ...