HTTP Error 500 (Internal Server Error) when i turn this module on

I'm not sure if this is a bug, or if i'm having some sort of version issue.
I've got Node gallery 3.x and Node Gallery display 2.x modules installed on Drupal 6.22, I'm also using PLupload and jquery update or the node gallery.
when I turn on the Gallery display module, I get a 500 error and the whole user side of my site goes down but the admin side is still available.

I'm not sure whats causing it, it could be as simple as needing Node gallery 2.X in order to run Node Gallery Display 2.x but if anyone has any suggestions please let me know.

Thanks for the help