Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method anchor_utils::filter() cannot be called statically in /customers/f/6/5/asichel.de/httpd.www/wp-includes/class-wp-hook.php:308 Stack trace: #0 /customers/f/6/5/asichel.de/httpd.www/wp-includes/plugin.php(205): WP_Hook->apply_filters('