Fatal error: Uncaught Error: Call to undefined function add_action() in /home/Pietrek2137/public_html/sobek123/wp-content/themes/sydney/inc/customizer/upsell/class-customize.php:48 Stack trace: #0 /home/Pietrek2137/public_html/sobek123/wp-content/themes/sydney/inc/customizer/upsell/class-customize.php(23): Sydney_Customize_Upsell->setup_actions() #1 /home/Pietrek2137/public_html/sobek123/wp-content/themes/sydney/inc/customizer/upsell/class-customize.php(101): Sydney_Customize_Upsell::get_instance() #2 {main} thrown in /home/Pietrek2137/public_html/sobek123/wp-content/themes/sydney/inc/customizer/upsell/class-customize.php on line 48