Fatal error: Uncaught Error: Class 'Composer\Command\UpdateCommand' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\flex\src\Command\UpdateCommand.php:20 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\flex\src\Command\UpdateCommand.php on line 20