Fatal error: Uncaught Error: Interface "Symfony\Component\HttpKernel\HttpKernelInterface" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\HttpKernel.php:39 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\HttpKernel.php on line 39