MyBB Community Forums

I am getting this strange error on both my forums today:

http://literaryforums.org
http://toonsandcomics.net

Fatal error: Class 'postParser' not found in /home/literary/public_html/forums/index.php on line 23

Is this a serious problem? I didn't do anything to my forum at all since yesterday but when I woke up this morning I see this error.

Make sure you have all your files uploaded, in particular, inc/class_parser.php.

Yes, I just FTPed and everything is up there. I even checked if the class exists. It does. Strange problem as I didn't change anything from yesterday to today.

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My hosts say I should change my PHP version in cpanel.

What PHP version are you currently running...??