Fatal error: Uncaught Error: Interface "Symfony\Component\HttpKernel\KernelInterface" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\Kernel.php:48 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\Kernel.php on line 48