Okay, I'm using After Effects CS4. I am on a Mac OSX 10.7.3
The message "Unepected Error" appears and is then followed by another window which says "After Effects can't continue: unexpected failure during application set up."
This all began when I was working on a project and left it for about an hour. When I came back to my computer AE had crashed and these are the messages I get when I try to re-start it.
I've recently switched computers and transfered all the software from the old one to this new one.
I used to have this same problem when I used AE on my old mac but deleted some files, I think 'Preferences', from the AE folder in Applications and this sorted the problem out.
'Preferences' don't appear in the AE folder on my new Mac.