An attempt to use CVData to create SP21 indices based upon FELT is not going so well.

I keep getting an error message that I have never seen before. This is my first attempt to work with SP21, so I suspect I am missing something very elementary.
The error message I get is:
Row 1 must have at least two player cards.

By the way: I have never played SP21, so I have a learning curve there also. I am just playing around with CVData to be sure I can use FELT with SP21.