Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /var/www/html/wp-content/plugins/wp-menu-icons/vendor/automattic/jetpack-composer-plugin/src/class-manager.php:18 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/wp-menu-icons/vendor/automattic/jetpack-composer-plugin/src/class-manager.php on line 18