Warning: Undefined variable $catalog in C:\xampp\htdocs\wp-content\plugins\nextgen-gallery-pro\modules\ecommerce\templates\add_new_print_item.php on line 12

Fatal error: Uncaught Error: Call to a member function get_root_categories() on null in C:\xampp\htdocs\wp-content\plugins\nextgen-gallery-pro\modules\ecommerce\templates\add_new_print_item.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\nextgen-gallery-pro\modules\ecommerce\templates\add_new_print_item.php on line 12