Fatal error: Uncaught Error: Interface "Google\ApiCore\Middleware\MiddlewareInterface" not found in C:\xampp\htdocs\www\prohelp\vendor\google\gax\src\Middleware\FixedHeaderMiddleware.php:41 Stack trace: #0 {main} thrown in C:\xampp\htdocs\www\prohelp\vendor\google\gax\src\Middleware\FixedHeaderMiddleware.php on line 41