Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class NumberFormatI18nClass does not have a method "init" in /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-includes/class-wp-hook.php:353 Stack trace: #0 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters(NULL, Array) #1 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-includes/plugin.php(523): WP_Hook->do_action(Array) #2 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-settings.php(630): do_action('plugins_loaded') #3 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-config.php(97): require_once('/var/www/vhosts...') #4 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-load.php(50): require_once('/var/www/vhosts...') #5 /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-login.php(12): require('/var/www/vhosts...') #6 {main} thrown in /var/www/vhosts/htqzqyov.host284.checkdomain.de/flm/wp-includes/class-wp-hook.php on line 353