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Error type: "Bad Request". Error message: "Bad Request" Domain: "usageLimits". Reason: "keyExpired".

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

Check in YouTube if the id PL7PzPXcv-qiw8AI9EBAvxY9VvdltnWHQp belongs to a playlist. Check the FAQ of the plugin or send error messages to support.