Team captain: Johan Van Eeckhout Position: Center
Member 2: Julien Delpuech Position: Center
Member 3: Alice De Brem Position: Point
Member 4: Nathalie Bruneau Position: Tail
Error type: "Bad Request". Error message: "API key not valid. Please pass a valid API key." Domain: "global". Reason: "badRequest".

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

Check in YouTube if the id PLJjA0i5oMak3tp2Fa4bDdsQjHjb8Ndz6X belongs to a playlist. Check the FAQ of the plugin or send error messages to support.