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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