Fatal error: Uncaught RuntimeException: Did not find vendor/autoload.php. Did you run "composer install --dev"? in /var/www/html/vendor/jms/serializer/tests/bootstrap.php:7 Stack trace: #0 /var/www/html/vendor/jms/serializer/tests/bootstrap.php(14): {closure}() #1 {main} thrown in /var/www/html/vendor/jms/serializer/tests/bootstrap.php on line 7