Yes you screwed with the XML, or installed a later version of XBMC without deleting TDATA/0face008 and UDATA/0face008 presumably you are using XBMC as a dash?
If you are you need to reinstall, XBMC by default will start up the FTP server on the box when you get this error, FTP in, delete the XML and replace it, there may also be errors about the Q drive? If so you need to clear the cache, there is a mismatch between Q XML and the XBMC.XML