error in hfss[12.01]&siwave[4.02] co-simulation~hope hel

i use siwave simulate the pcb's farfield emi(radition boundary)

and set the siwave project file as incident wave /far field wave(enforced field) and the airbox (radiation only) in HFSS

then insert far field setup

i set the same sweep in both siwave and hfss.

but when i start simulation,it shows "unable to obtain far field date to support data link for source IncFFwave1"

How to slove this problem?hope help