this is the best way to get your travel to Taubertal-Festival organized:
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/quotas?project=620380823382" Domain: "usageLimits". Reason: "dailyLimitExceeded".
Did you added your own Google API key? Look at the help.
Check in YouTube if the id taubertaltv belongs to a username. Check the FAQ of the plugin or send error messages to support.