I put a set of 4 radio buttons into in a screen and I keep getting an error that SHRAD_OXUD prg does not exist.

The following is highlighted when the error occurs

#REGION 2
SHOW GET m.leaseend
=shrad_oxud('CAR','R',0,'m.payment',@_rfx0zoxv4,'RADIO','MS Sans Serif',8,'B ',[])

I am compiling the program with GENSCRNX and I am using the TABS driver