FYI, the file JM mentioned is actually in freeswitch/log directory. :)
The file "freeswitch.fsxml" is the monster file that has all of the individual XML files included. When you got find line 3379 you'll most likely see a missing ">" char on line 3378 or near there. You'll have a few more of these before you're an expert, I guarantee it. :D It's frequently just a typo.
-MC
Look at this line on the freeswitch.fsxml and it will tell you exactly where the problem is.
Beware that nested comments are not allowed in XML.
-- JM