Error Compiling Movie... some past discussions and ideas
May be caused by . in name https://forums.adobe.com/thread/2166620
-1st, create a new project and import the project that has errors and see if that fixes the problem
-and a long discussion https://forums.adobe.com/thread/1240823
You might also try High Quality Adaptive bitrate. For some people that has fewer issues.
I saw this posted elsewhere. Looking through the long discussion is quite time consuming and some of the solutions aren't really feasible - as I am working within 'team projects'. I am looking for answers about those who have experienced that specific error code (#3) and what that means.
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No luck with High Quality Adaptive bitrate. Alas- I keep searching! Adobe, please help!
Try setting an in point at the second or third clip, and see if the export works.
It could be there's an issue with something off in the first clip or the effects used there or the media cache/database for that clip or section of the timeline.
If that export goes through that tells you there's something wrong at the beginning. You could then delete everything in media cache/database folders and/or rebuild the first clip or two.