Fatal error: Uncaught Google\Cloud\Core\Exception\GoogleException: The requested client requires the gRPC extension. Please see https://cloud.google.com/php/grpc for installation instructions. in D:\wamp64\www\karma\vendor\google\cloud-core\src\ClientTrait.php:76 Stack trace: #0 D:\wamp64\www\karma\vendor\google\cloud-firestore\src\FirestoreClient.php(139): Google\Cloud\Firestore\FirestoreClient->requireGrpc() #1 D:\wamp64\www\karma\functions.php(32): Google\Cloud\Firestore\FirestoreClient->__construct(Array) #2 D:\wamp64\www\karma\Firestore.php(8): Firestore->__construct('test') #3 {main} thrown in D:\wamp64\www\karma\vendor\google\cloud-core\src\ClientTrait.php on line 76