Might be useful to tell what you are trying to do when you get the error. Starting After Effects? Installing After Effects? Saving a project? ect.. ect..
The more specific you are the more likely someone will be able to help you.
The error appears when I'm starting after effects
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There are a lot of folders where your permissions need to be set correctly. Sounds like you missed one (very easy to do). Sometimes it helps to just move the whole directory elsewhere. That way AE has to recreate it from scratch (with correct permissions) when you launch it.
Worked for me thanks!!