Fatal error: Uncaught Error: Call to undefined function add_filter() in /home1/blackpepperr/public_html/wp-content/themes/sushi/framework/register_custom_attributes_in_menu.php:3 Stack trace: #0 {main} thrown in /home1/blackpepperr/public_html/wp-content/themes/sushi/framework/register_custom_attributes_in_menu.php on line 3