Title: Warning: call_user_func_array() expects parameter 1 to be a valid callback
Last modified: August 21, 2016

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

 *  [tran062](https://wordpress.org/support/users/tran062/)
 * (@tran062)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/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!

The topic ‘Warning: call_user_func_array() expects parameter 1 to be a valid callback’
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## Tags

 * [call_user_func_array](https://wordpress.org/support/topic-tag/call_user_func_array/)
 * [warning](https://wordpress.org/support/topic-tag/warning/)

 * In: [Everything else WordPress](https://wordpress.org/support/forum/miscellaneous/)
 * 0 replies
 * 1 participant
 * Last reply from: [tran062](https://wordpress.org/support/users/tran062/)
 * Last activity: [12 years, 8 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-expects-parameter-1-to-be-a-valid-callback/)
 * Status: not resolved

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