Error type: "Forbidden". Error message: "Project 52950748086 has been scheduled for deletion and cannot be used for API calls. Visit https://console.developers.google.com/iam-admin/projects?pendingDeletion=true to undelete the project." Domain: "usageLimits". Reason: "accessNotConfigured".

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

Check in YouTube if the id UCZxlHym8v-1HQOItC0SoDTg belongs to a channelid. Check the FAQ of the plugin or send error messages to support.