Fatal error: Uncaught Error: Interface 'GuzzleHttp\ClientInterface' not found in /var/www/html/ng-crm/yiiapp/vendor/kreait/firebase-php/src/Firebase/Messaging/ApiClient.php:20 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/kreait/firebase-php/src/Firebase/Messaging/ApiClient.php on line 20