Help required for simulation in HFSS

hi friends I have designed patch antennas directional coupler in HFSS
when i start simulation it always give me error for "mesh"
When I solved examples from tutorials of HFSS it was not giving error.
I followed the same standard procedure for patch anenna design * simulation.

Hi.
In the Solution setuo-->option-->target must be less
or
Solution setup-->General-->Number of pass must be greater
or
Solution frequency must chosed right.
Have a good night. Bye.

Added after 13 minutes:

Hi.
The version of software may be don't act properly the soft ware is cracked and not suport this mesh.
bye

upload your model, we can inspect what is wrong with your project.

I have simulated it
The proble was with software(HFSS 10)
So I used older version(9.1) & SImulated successfully
thanks for your suggestion