Interesting there my friend! HMM have you made any recent changes that would help here?
The line your referring to has to do with caching gallery moderators
Code:
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This is taken right from our latest code. Have you changed any moderators done anything of the sort as far as actions so I can test and see if I can get this error?
Try running the vbgallery install script and select the update settings cache and see if this helps as well.