private void NotifyEmptyConfig(CloudRecognizerServiceConfig config)
 {
     if (string.IsNullOrEmpty(config.ServerAddress) ||
         string.IsNullOrEmpty(config.APIKey) ||
         string.IsNullOrEmpty(config.APISecret) ||
         string.IsNullOrEmpty(config.CloudRecognizerAppID))
     {
         throw new UIPopupException(
                   "Service config (for authentication) NOT set, please set" + Environment.NewLine +
                   "globally on <EasyAR Settings> Asset or" + Environment.NewLine +
                   "locally on <CloudRecognizerFrameFilter> Component." + Environment.NewLine +
                   "Get from EasyAR Develop Center (www.easyar.com) -> CRS -> Database Details.");
     }
 }