Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/america2/public_html/wp-content/plugins/advanced-product-labels-for-woocommerce/berocket/libraries/tutorial.php:10 Stack trace: #0 /home/america2/public_html/wp-content/plugins/advanced-product-labels-for-woocommerce/berocket/libraries/tutorial.php(314): BAPF_tutorial_tab->__construct() #1 {main} thrown in /home/america2/public_html/wp-content/plugins/advanced-product-labels-for-woocommerce/berocket/libraries/tutorial.php on line 10