Comments could not be added. Redirecting.

[Dr_Michael]

This is the message that every guest gets when trying to add a comment to the photos of this gallery:
http://www.eliaselias.gr/gallery/
"Comments could not be added. Redirecting..."
I checked on group settings and guests comments was set to "yes".
What happens.

[Nibbler]

This message is not from Coppermine; you have made custom alterations that are causing this.