need help in waveguide port in cst

hi
i am a beginner and i am using cst for just one week and i designed a simple patch antenna and i applied coaxial fed waveguide port and ran the simulation but error msg came like this "waveguide for port 1 is too short"
i urgently need a help in this.pls

Hi,
try find in this forum, typical problem. before you need homogenous 3 mesh cells. Increase meshcells or better: little change your structure.

thank you very much .i try and tell u.