class ‘Twilio’ does not have a method ‘user_phone_confirm_func’

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘Twilio’ does not have a method ‘user_phone_confirm_func’ in /home/vlordier/public_html/my/wp-includes/plugin.php on line 524

is this needed?

add_action(‘wp_footer’, array($this, ‘user_phone_confirm_func’));