Fatal error: Uncaught Error: Call to undefined function add_action() in /srv/www/vhosts/busbar.ch/httpdocs/wp-content/themes/soundboard/woocommerce/css/woocommerce_css_options_panel.php:207 Stack trace: #0 {main} thrown in /srv/www/vhosts/busbar.ch/httpdocs/wp-content/themes/soundboard/woocommerce/css/woocommerce_css_options_panel.php on line 207