Fatal error message blocking member access to boards

This appears sporadically, but appears to relate to vBSEO. At intervals, many of my members get this error message when trying to access parts of the forum. One member even reports having to refresh the page for nearly 20 minutes before getting into the boards. My forums are located here: Zelda Universe - All the Zelda info you need!

This is the error:

Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /home/zelda/public_html/forums/global.php(407) : eval()'d code:39 Stack trace: #0 /home/zelda/public_html/forums/global.php(407) : eval()'d code(39): SimpleXMLElement->__construct('') #1 /home/zelda/public_html/forums/global.php(407): eval() #2 /home/zelda/public_html/forums/forumdisplay.php(101): require_once('/home/zelda/pub...') #3 /home/zelda/public_html/forums/vbseo.php(1470): require('/home/zelda/pub...') #4 {main} thrown in /home/zelda/public_html/forums/global.php(407) : eval()'d code on line 39

Please help!

Hello,

this issue should not be related to vBSEO, you can see "vbseo.php" in the error message since all requests are passed through that file. Try to disable vB mods one-by-one when you get the issue.

Start with ones that process feeds, rss, or some other xml stuff