Meshing error when modeling a patch antenna in HFSS v.10

Hi all!

I've a trouble modeling a patch antenna in HFSS v.10
It still displays a meshing error report:

Volume meshing failed.
Fault tolerant mesher failure. Error in stitch module.

I think it's related to some mistake I did in desing
but I'm not able to find out the bug.

Could anybody be so kind to shine a light upon this problem?



Thanking in advance, best regards,


Eng.A!
E.R. Group