I can't upload my score, there is a message saying 'Error Can't be sent: ()'. Please, can someone help me

void LoginManager::onUploadReply(QNetworkReply* reply, int code, const QJsonObject& obj)
      {
      qDebug() << "onUploadReply" << code << reply->errorString();
      if (code == HTTP_OK) {
            constexpr const char* pathKey = "_webview_url";
            _updateScoreDataPath = obj.contains(pathKey) ? obj.value(pathKey).toString() : QString();
 
            if (obj.value("permalink") != QJsonValue::Undefined) {
                  emit uploadSuccess(obj.value("permalink").toString(), obj.value("id").toString(), obj.value("vid").toString());
                  }
            else {
                  emit uploadError(tr("An error occurred during the file transfer. Please try again"));
                  }
            }
      else
            emit uploadError(tr("Cannot upload: %1").arg(getErrorString(reply, obj)));
      }