Title: Warning function not found plugin.php line 503
Last modified: August 30, 2016

---

# Warning function not found plugin.php line 503

 *  [WPBlonde](https://wordpress.org/support/users/wpblonde/)
 * (@wpblonde)
 * [10 years, 6 months ago](https://wordpress.org/support/topic/warning-function-not-found-pluginphp-line-503/)
 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, function‘
   my
    theme_dequeue_fonts’ not found or invalid function name in /home6/mandybra/
   public_html/wp-includes/plugin.php on line 503
 * This message just started showing up either in header or before header. All plugins
   deactivated and no change. I’m not sure what it means and need some assistance.
   Have worked in functions so technical explanation of what is going on and how
   to fix it would be greatly appreciated.

The topic ‘Warning function not found plugin.php line 503’ is closed to new replies.

## Tags

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

 * 0 replies
 * 1 participant
 * Last reply from: [WPBlonde](https://wordpress.org/support/users/wpblonde/)
 * Last activity: [10 years, 6 months ago](https://wordpress.org/support/topic/warning-function-not-found-pluginphp-line-503/)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics