Same problem. I had 2 potential app/plug-in conflicts. Cinema Grade, and Insta360. removed them from the plug ins folder, emptied my trash, restarted AE and it opened as it should. I uninstalled the apps but that did not remove the plug ins inside the adobe folder. If you're unaware (as I was) of the location of these items:
Go into your Macintosh HD >Library >Application Support
>Plug-Ins inside the plug ins folder you will find the offending items to remove. Now go make cool stuff!