Fatal error: Uncaught RuntimeException: Did not find vendor/autoload.php. Did you run "composer install --dev"? in /home/lafaamicps/www/symfony/vendor/jms/serializer/tests/bootstrap.php:23 Stack trace: #0 /home/lafaamicps/www/symfony/vendor/jms/serializer/tests/bootstrap.php(31): {closure}() #1 {main} thrown in /home/lafaamicps/www/symfony/vendor/jms/serializer/tests/bootstrap.php on line 23