Fatal error: Uncaught exception 'RuntimeException' with message 'Did not find vendor/autoload.php. Did you run "composer install --dev"?' in /var/www/html/vendor/bundles/JMS/SerializerBundle/Tests/bootstrap.php:23 Stack trace: #0 [internal function]: {closure}() #1 /var/www/html/vendor/bundles/JMS/SerializerBundle/Tests/bootstrap.php(43): call_user_func(Object(Closure)) #2 {main} thrown in /var/www/html/vendor/bundles/JMS/SerializerBundle/Tests/bootstrap.php on line 23