Simulation Error in HFSS 13

Hi, Is there anyone can help me to simulate the attached design. When i tried to simulate it shows this error. "Probe_1"Boundary 'Rad1': A radiation boundary face has solid objects with SolveInside on both sides of it. Please check setup, as this could produce incorrect results.

Thank you.

This error is letting you know that you have a radiation boundary INSIDE your model. Radiation boundaries are only to be assigned on the outer faces of the airbox

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Hi.I need help because I have faced a problem in simulation a design in HFSS.
I draw my design,define boundary conditions and excitations and I press Validation check button.It bears error:At least one material assignment should have solve inside set.I don't understand what it says.please help me.