Critical error when trying to view properties of some Gallery or edit files

[timony]

When I click on propertis of some gallery, I get a critical error "There was an error while processing a database query". Same result is by selecting edit files.
Does anybody know, where is the problem? All other database actions work perfect.

I'm also not able to add gallery to the category... Can you help me?

Thanks Tomas

[Nibbler]

Enable debug mode in config and post the sql error message that you get when you replicate the error.