Title: Errors from activating/deactivating
Last modified: August 21, 2016

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# Errors from activating/deactivating

 *  [whitewall](https://wordpress.org/support/users/whitewall/)
 * (@whitewall)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/errors-from-activatingdeactivating/)
 * Activating and deactivating plugin gives following errors:
 *     ```
       [11-Apr-2014 21:31:05 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, function 'deactivate' not found or invalid function name in /usr/www/users/xxx/wp-includes/plugin.php on line 429
   
       [11-Apr-2014 21:32:33 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, function 'activate' not found or invalid function name in /usr/www/users/xxx/wp-includes/plugin.php on line 429
       ```
   
 * How they could be fixed?
 * [https://wordpress.org/plugins/wp-phpbb-bridge/](https://wordpress.org/plugins/wp-phpbb-bridge/)

The topic ‘Errors from activating/deactivating’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [whitewall](https://wordpress.org/support/users/whitewall/)
 * Last activity: [12 years, 1 month ago](https://wordpress.org/support/topic/errors-from-activatingdeactivating/)
 * Status: not resolved