Fatal error: Uncaught Error: Class "GrumPHP\Task\AbstractExternalTask" not found in /var/www/public/git/vendor/phpro/grumphp/src/Task/Composer.php:18 Stack trace: #0 {main} thrown in /var/www/public/git/vendor/phpro/grumphp/src/Task/Composer.php on line 18