Hi,
This looks like an xml file got corrupted somehow and is no longer valid xml. Unless you have customized it to use a different file, then the file in question is mojoProfile.config in the root folder of the web. I would upload that file again and/or inspect it with a text editor on the server.
Sometimes I have seen issues where xml files get corrupted during ftp upload. I use FileZilla for ftp and it seems to work well.
Hope it helps,
Joe