added error when room cannot be created

rocketchatserver.cpp

@@ -2040,7 +2040,19 @@ void RocketChatServerData::createPublicGroup( const QString &pChannelName, const
             }
         }
     };
-    auto request = QSharedPointer<RocketChatCreatePublicGroupRequest>::create( pChannelName, pUsers, pReadonly );
+    DdpCallback errorFunc = [ = ]( QJsonObject object, MeteorDDP * ) {
+        QString reason;
+        QJsonObject errorObject = object["error"].toObject();
+        if(errorObject.contains("reason")){
+            if(errorObject.contains("reason")){
+                reason = errorObject["reason"].toString();
+            }
+        }
+        emit error(tr("Room creation failed. ")+reason);
+        return;
+    };
+    auto request = QSharedPointer<RocketChatCreatePublicGroupRequest>::create( pChannelName, pUsers, pReadonly,success );
+    request->setError(errorFunc);
     sendDdprequest( request );
 }