Crashing when logging a character in sometimes

[DMN]

I just log in a char and get crashed out of the game, then it makes me wait for a time out, and then when I finally get to try to log back into the server again I get this along with a second crash:

Error in XML
Error in your GUI XML files. Check UIerrors.txt



All that file says is a log was made.

So it crashes, makes me wait for timeout, and then finally lets me get in but then immediately crashes me.