Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "non_existing_function" not found or invalid function name in /home1/dunaway/public_html/wp-includes/class-wp-hook.php:341 Stack trace: #0 /home1/dunaway/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #1 /home1/dunaway/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #2 /home1/dunaway/public_html/wp-settings.php(771): do_action('init') #3 /home1/dunaway/public_html/wp-config.php(85): require_once('/home1/dunaway/...') #4 /home1/dunaway/public_html/wp-load.php(50): require_once('/home1/dunaway/...') #5 /home1/dunaway/public_html/wp-blog-header.php(13): require_once('/home1/dunaway/...') #6 /home1/dunaway/public_html/index.php(17): require('/home1/dunaway/...') #7 {main} thrown in /home1/dunaway/public_html/wp-includes/class-wp-hook.php on line 341