Fatal error: Uncaught Error: Call to undefined function add_thickbox() in /users/robiniffert95/www/gustavguns/wp-content/plugins/envato-market/inc/admin/view/callback/admin.php:18 Stack trace: #0 {main} thrown in /users/robiniffert95/www/gustavguns/wp-content/plugins/envato-market/inc/admin/view/callback/admin.php on line 18