In reply to cgales:
Hi,
I guess its a Runtime error, I just gave an example similar to my code.
The error says
Error-[ICSD] Illegal combination of drivers
The variable is declared at filename: linenum1
The first driver is at filename: linenum2
assign sig1[1] = sig2[1];
The second driver is at filename: linenum2
assign sig1[0] = sig2[0];