Warning on all pages and Fatal Error when PMing

[evilmonkeyman]

Hey guys, I just upgraded my forum from 1.1.13 to 2.0 rc5 and am getting the following warning on the top of my page.

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Warning: set_error_handler() expects the argument (error_handler) to be a valid callback in /home/content/00/7512500/html/index.php on line 112

I am also getting the following warning and fatal error when I go to pm someone:

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Warning: call_user_func(MessageMain) [function.call-user-func]: First argument is expected to be a valid callback in /home/content/00/7512500/html/index.php on line 162
Fatal error: Call to undefined function fatal_lang_error() in /home/content/00/7512500/html/Sources/Load.php on line 1876

I searched for it here but couldn't find any answers.  Anyone know how to fix this?

Thank you
Brett

Update:
Reinstalled and errors/warnings went away.  Everything appears to be working.  Thanks for the help.