HFSS error (Surface mesh is deformed too much on bodies)

hi,
I am using HFSS 12.1 and designing antenna but getting error everytime I want to simulate and the simulation terminates. the error says "Surface mesh is deformed too much on bodies: (Port 1)". Can anyone explain why is it so?
Thanks

Hi Techi
Take a glance at HFSS> mesh operation
What is your simulated structure?

hi myazdi83, thanks and I solved the problem by shifting the point of lumped port.