"Undeclared variable"

[Paragon]

I'm getting an error message on an eval script I'm trying to put together, and my suspicion is its a timing issue, but fiddling with that has not fixed the problem, so perhaps I'm missing something. I'm trying to put together an if-then result using two hero fields, and I'm getting an error that one is an "undeclared (not undefined) variable". Any thoughts about what the problem might be from anyone?