Event Properties missing?

Hello, I have gotten essentially all the base components of my bot to work at this point, but when booting up the only thing that runs into trouble now is the event I have. The loader says that it is missing a property from the template, but from what I can tell there does not seem to be anything missing, have I written something incorrectly in the template or event? The event is intended to detect when a user completes the Discord Onboarding and then give them a basic role if they have not already been given another one of the main roles.