There is a statement in the Definitions.

Global Time(1 To 100) As Variant

And your Time() has reached 101 so it messages you have gone over the range assigned, which is 100.

I have no idea , but I think this may mean the Program is restricted to 100 Races.

Did you ever run this program when there were more than 100 Races on the day?
You possibly have so there goes my thoughts