I am trying to design an antenna in HFSS, I draw a shape using polyline and made a shape using type as rectangular, but while i am validating my design. It is showing error in 3D design. Could anyone help me to solve this problem? 

 

Here, i also saw that if go HFSS>>Design Setting>>Set material override>>clik on Skip Intersection Check>

And now it does not show the error. Could you tell me how can do this by not skipping intesection check. Thank you