Team captain: Kim de Vries Position: Inside center
Member 2: Bart Roelofs Position: Outside center
Member 3: Anke Schuurmans Position: Point
Member 4: Davy van de Walle 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 PLJjA0i5oMak2RbieWzn0PaFp7bG0MEfSX belongs to a playlist. Check the FAQ of the plugin or send error messages to support.