I only recieve this error when I try to goto the PM inbox.

Fatal error: Call to a member function menu_bar_new_link() on a non-object in ********/testforum/sources/components_ucp/gallery.php on line 50

I suppose it has something todo with the gallery I had on 2.1?

Anyone have an idea as into how to fix it?

A temp fix until you upgrade the gallery for 2.2 is to either delete or rename the gallery.php file to something like: gallery.php.OLD in your: sources/components_ucp/
If you delete it make sure to save it in case you need it for something later on. I just went through this with a points mod I have installed.