Infomaker 12 Issue with Constituent Search Chicklet

I'm trying to implement a constituent search chicklet in an old custom screen.  This includes adding a new column in the return set that populates the screen.

I've followed the instructions closely, and all looks normal in Infomaker (of course none of this functionality exists there without being interpreted by Tessitura), but when clicking on the chicklet Tessitura crashes with this error:

"Windowmenu: uo_dw_base
Object: uo_dw_base
Objectevent: clicked
Line: 209
Error Code: 6
Error Text: Invalid DataWindow row/column specified at line 209 in clicked event of object uo_dw_base."

Adding a number manually works just fine.