When I Click "Update" I Get Warning Message

  • Sometimes when I have done some writing, and click “Update,” I get a blank screen with this warning message —

    Warning: call_user_func() [function.call-user-func]: First argument is expected to be a valid callback in /home4/lbfb/public_html/wp-includes/functions.php on line 2117

    Can anyone help me with this?

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