Vivaldi antenna HFSS design and simulation

Hi everyone,

I'm trying to simulate Antipodal Vivaldi antenna in HFSSv12, but when I do it, something's wrong in all diagrams, so I think that antenna isn't working properly. Is there anyone who could see this antenna and tell me what's wrong with it's design, so I could simulate it properly and get some good diagrams.
viv1.rar

Thank you all,
kokuz