Title: Error in call_user_func_array()
Last modified: October 18, 2016

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# Error in call_user_func_array()

 *  [roxer82](https://wordpress.org/support/users/roxer82/)
 * (@roxer82)
 * [9 years, 7 months ago](https://wordpress.org/support/topic/error-in-call_user_func_array/)
 * Hello.
    I’m having this error: <b>Warning</b>: call_user_func_array() expects
   parameter 1 to be a valid callback, function ‘xyz_amp_additional_css_styles’ 
   not found or invalid function name in <b>/home/…/public_html/wp-includes/plugin.
   php</b> on line <b>524</b><br />

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 * 0 replies
 * 1 participant
 * Last reply from: [roxer82](https://wordpress.org/support/users/roxer82/)
 * Last activity: [9 years, 7 months ago](https://wordpress.org/support/topic/error-in-call_user_func_array/)
 * Status: not resolved