Team captain: Tessa Heijl Position: Tail
Member 2: Stephanie Deloni d' Aure Position: Inside Centre
Member 3: Wouter Steijvers Position: Outside Centre
Member 4: Jan Verhoeven Position: Point
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 PLJjA0i5oMak0qTgWCQZJxR6t0HK6iaukA belongs to a playlist. Check the FAQ of the plugin or send error messages to support.