Team captain: Lamberto Busnelli Position:
Member 2: Luca Marchioro Position:
Member 3: Stefano Barbieri Position:
Member 4: Laura Fontanella Position:
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 PLJjA0i5oMak0CEVcl998urFZbjNbIRtBh belongs to a playlist. Check the FAQ of the plugin or send error messages to support.