Fatal error: Uncaught RuntimeException: Did not find vendor/autoload.php. Did you run "composer install --dev"? in C:\xampp\htdocs\sitewebanader\pvmsagri\vendor\jms\serializer\tests\bootstrap.php:23 Stack trace: #0 C:\xampp\htdocs\sitewebanader\pvmsagri\vendor\jms\serializer\tests\bootstrap.php(30): {closure}() #1 {main} thrown in C:\xampp\htdocs\sitewebanader\pvmsagri\vendor\jms\serializer\tests\bootstrap.php on line 23