[help HFSS] What this error message means?

hi, i just run my simulation but it end up with this message:

[error] Port refinement, process abc3d : There are no tetrahedral faces assigned to boundary "Short". Since boundary operations are order dependent, please check to make certain that this boundary is not being ignored because of other operations on the same surface. It is recommended that you redefine the boundary in question.

does anyone knoe wut this means?
cheers,

enyxep