Fatal error: Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "bbloomer_woocommerce_holiday_mode" not found or invalid function name
in /homepages/24/d25460770/htdocs/sauschwaenzlebahn.de/wp-includes/class-wp-hook.php on line 287
Call stack:
WP_Hook::apply_filters()
WP_Hook::do_action()
do_action()
require_once()
require_once()
require_once()
require()