Step not complete in playground un-expected error id BGGYVVUP

Hi, I'm attempting the 'create a custom candidate record page' on the 'Customise the User Experience for a Recruitment App' badge, and im getting an unexpected error. im using the same playground that i created specifically for the AW computing tasks and its the first time its come up as a problem. when i create a brand new playground it is still coming up with the same error?(although i haven't started at the beginning again with it)