I don't know the answer to your question but just had comment on the irony of...
Needing a computer engineering degree appears to be a prerequisite for working with the Adobe apps.
There was a time when that was actually true...or very close to true anyway.
Do you have any script UI panels open in your AE interface?
No script UI panels. Again, these projects can be opened either from within AE or even from Windows Explorer if AE is already open and running. It does appear that the error comes only for projects that were created in an earlier version of AE and have been converted. However I also have many other converted projects that open without error.
I have occasionally gotten this error too. I haven't really troubleshot (troubleshooted?) it enough to figure out the cause since it's a harmless message, but I am getting a bit curious about it. Maybe I'll poke at it a bit this weekend.
Sorry for this issue. Did you ever find a solution? Please let us know if our experts’ advice helped you or if you still need help.
I have the same issue with a lot of projects, but not all of my projects. And I do have ScriptUI Panels open. Still no solution?