Error type: "Too Many Requests". Error message: "Quota exceeded for quota metric 'Search Queries' and limit 'Search Queries per day' of service 'youtube.googleapis.com' for consumer 'project_number:471391552561'." Domain: "global". Reason: "rateLimitExceeded".

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

Check in YouTube if the id UCEpLCHgWgVf5IrIXBwmNYTw belongs to a channelid. Check the FAQ of the plugin or send error messages to support.