Fatal error: Uncaught Error: Class 'Composer\Command\UpdateCommand' not found in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\flex\src\Command\UpdateCommand.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\flex\src\Command\UpdateCommand.php on line 19