Quote from AllaraVisceroid, be aware that since this is the day before 3.0, many add-ons have been updated for the patch, and you may be seeing some errors that only happen on 2.4. Best to wait until tomorrow to actually update everything.
I know that was what I was thinking as well.. but I already updated 2 days ago when the errors happened and I guess not many WotLK addons were downloaded from curse there yet.
Also all but 2 addons showed a 20300 or 20400 TOC in WUU. The other 2 showed 30000 so I guessed they couldn't work and disabled/deleted them.
Re-Installing CC client atm and trying to update with it again. This thing really needs a "rescan addons from harddisk" option. Un&Reinstalling it everytime you manually delete something from your addon folder is a pain.
Found one part of the errors: The addons on curse are packed differently apparently compared to wowace. With WAU I got folders like this:
now when I updated with CC it looked like this
and so on ^^ this was causing around 40 "double registration" errors when logging in (of course ^^ addons DID exist twice).
This nevertheless leaves me with 7 unsolved errors (most of them "attempt to index local 'frame' (a nil value)") after updating with the CC. I'll see if the problems go away after 3.0.2 actually hits us.