Warning: call_user_func_array() expects parameter 1 to be a valid callback

  • Hi

    After the update to 3.6.1, I received this warning on top of every formidable form/calendar.

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /home/XXX/XXX/wp-includes/plugin.php on line 173

    The warning disappears when I disable Formidable plugin but how do I fix it?

    Thanks in advance!

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