Fatal error: Uncaught Error: Class "League\Fractal\Serializer\SerializerAbstract" not found in C:\xampp\htdocs\projet-GMAO\vendor\league\fractal\src\Serializer\ArraySerializer.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\projet-GMAO\vendor\league\fractal\src\Serializer\ArraySerializer.php on line 18