Error type: "Forbidden". Error message: "Daily Limit Exceeded. The quota will be reset at midnight Pacific Time (PT). You may monitor your quota usage and adjust limits in the API Console: https://console.developers.google.com/apis/api/youtube.googleapis.com/quotas?project=568724207092" Domain: "usageLimits". Reason: "dailyLimitExceeded".

Did you added your own Google API key? Look at the help.

Check in YouTube if the id UCR6xBsJtChA21eEoBXnCMQg belongs to a channelid. Check the FAQ of the plugin or send error messages to support.