I had problems with my MacBook Pro shutting down with no reason so I installed an older version of the OS, Snow leopard, and had to reinstall my Adobe Premium Suite. After installing that After Effects will not open. I get many errors from multiple copies of certain plugins to "sweet pea failure" to "can't open due to failure to register built-in motion tracker." I am using AE 10.0. it sure would be nice to have this work again since I have many many files created with AE. Can anyone help?
Uninstall your Adobe stuff. Run the CC Cleaner app from Adobe.
Reinstall your Adobe stuff.