Ignore previous one, issue was found.

Playing with these, I was getting an error when a track club event ran in the Sports Area, very early game.
Tracked it down to:  Events\Location\School\Sports Area\TrackClub_PoleVaultTraining.ve.xml
The very bottom row in the VEE, where it shows a picture and text indicating the member failed, right after that where it updates the person's stats, that person object isn't properly linked to the person it chose in the Try phase. It's just an unset object, which triggers an error.
I confirmed that replacing that with a properly linked person object fixed it for me.