Very Urgent: Piezoelectric Filter Lumped Port Problem

Hi
I am trying to find the s parameters of a mechanically coupled piezoelectric filter with lumped port. But even though I have defined the perfect conductor, I get this error:
Errors during multiphysics.
Uniform lumped port should be placed between two conductive boundaries.
- Feature: Type: Lumped Port
Tag: lport1
Operation: LumpedPort (lport1)
Uniform lumped port should be placed between two conductive boundaries.
- Feature: Type: Lumped Port
Tag: lport2
Operation: LumpedPort (lport2)
Can someone help me please? I attached the file as well.
Thanks