FEKO6.1 creatig mesh

Hi everybody.
Few days ago i installed FEko 6.1. and im trying to build structures(like horn or microstrip ant. and...). but i have a problem with meshing the structures.
when i want to create mesh, it runs but never finish doing meshing and shows this message: "creating mesh..." in message box below.
could anybody help me in finding the fault. im used to feko 5.5 but didnt have mesh problem.
in addition it is not feko lite version.

thanks