Waveguide to coax transition in WASPNET

Hi everyone

I am trying to simulate Waveguide to coax transiton inWaspnet.. ( tutorial example)
it is showing some error in black window.

all other tutorial are working fine..

the error showing is in black window..
path not specified like msg flashing

plzz any one help in this regard[/b]

please reply the post
I am eagerly waiting for answer