Team captain: Reijmen Ronald Position: Outside center
Member 2: Breeur Eef Position: Point
Member 3: Seber Roy Position: Inside center
Member 4: Seber Deborah 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 PLJjA0i5oMak0gDydVjcBQi51P8_CzhY41 belongs to a playlist. Check the FAQ of the plugin or send error messages to support.