Fatal error: Uncaught Error: Call to undefined function add_filter() in /usr/www/east110006/heizemod.us/heizemod/wp-content/themes/twentytwentyone/inc/menu-functions.php:39
Stack trace:
#0 {main}
thrown in /usr/www/east110006/heizemod.us/heizemod/wp-content/themes/twentytwentyone/inc/menu-functions.php on line 39