I see nothing unusual here. Files go missing when their paths and location have changed. It's easy enough to relink them. The second error is AE trying to verify a setting stored in the prefs because the project may reference e.g. a specific workspace. You would simply fix the permissions of the Library folder. Again, neither of the errors is totally unexpected nor illogical in a technical sense.
Guess the problm is that I don't fully understand the "pronlem" state in the second pop-up window:-)
The relink issue in the first window is easy enough, but the file doesn't open when I press "ok" on the second window.
where can I fix the permission and how to fix it?
It took a while but only because my "Library" icon wasn't visible:-)