So I now took the plug-ins where i got the error out of the plug-in folder and now I obviously dont get the plug-in errors anymore and the damaged file error is also gone but my after effects still closes itself before it loads the projectfile
I sure hope that one of the folks here have a solution for you but if you have already tried your auto-saves, this does not sound good to me.
I've only had a couple instances where the project got so corrupted, I lost it all but your symptoms are pointing that way.
Have you tried the usual of clearing cache (obviously by opening a different project that works)? Not sure that will do anything but worth a try.
it closed itself again
One other thing that might be worth trying:
Open after effects - and import your 'damaged' project into a new project.
+1 to what Mike said.
if you just absolutely can't get a project to open or load properly it's always worth trying to import it into a new project.
after effects closed itself again. i found out that a 1 week old auto-save works but it happened way too much in that time so yeah. still thx for your help