Hey guys, I know a lot of people run into these sort of issues when installing/updating/or transferring applications to a new hard drive.
I had the same error after I cloned my OS drive to a new SSD. The solution is simple if you know just a few neat little tricks.
I left the error window up and opened up a new finder window so I could trace the path. While you have the finder window open go up to the top bar and drop down the “Go” menu tab, while it is dropped down press the “alt” key. You should see a new “Library” option in the drop down menu appear. Im not a technical wiz but I like to call this library the hidden library. I have no idea why you can’t get to it any easier way.
But once you select that library just follow the error path and along the whole route I hit “Command + I” to pull up the info on every folder in the path, unlocked it and changed permissions to “read and write”, double checked to make sure I got them all, went back into AE hit “ok” on the error message then reopened the same project and presto it was fixed :D.
Hope this helps somebody, the hidden library trick comes in handy a lot.