Whatever it is, it's certainly a fault at the Mudcat end of the piece of wet string, not at your end.
In simple terms, The web server bit of Mudcat is talking to the database part of Mudcat and apparently asking for things that don't exist, or by the wrong name, or the file containing the database table has gone AWOL.
Nothing we can do about it but wait for Max to fix it, at an educated guess.