do you have writing permission for the project folder (on windows the "read only" should be unchecked, on Mac there should be a similar preference). I'd suggest you contact RG again and see what they suggest when reinstalling dont work.
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Get a version that is actually compatible, don't just reinstall your old stuff.
Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.
Hi Kevin, I'm also experiencing exactly this problem in CC17 126.96.36.199 with trapcode Form V2.2. Uninstall and reinstall of both AE and Trapcode doesn't not rectify the problem.