ansoft designer error

I'm using ansoft designer3 to simulate a broadband stripline hybrid. the line is a coupled line with offset (SLOCL). there is an error saying WC(horizontal spacing between coupled lines) is grater than W(line width), but in the help menu of designer there is no limitation on this spec.
can anyone fix the problem?
the file is attached.

Easy Fix...Upgrade to Designer 6.0...Designer 3.0 is waaaay old