When I run a high frequency analysis using the attached file
in ANSYS8.1, ANSYS returns the error message:

*** ERROR *** CP= 354.422 TIME= 17:06:32
The element with PML attribute is not found. Element 106720.

Would you tell me what is causing the error?

I've already checked #222401 of the Knowledge Base, but that
does not apply - the element edges of the PML elements are parallel

Element 106720 is completely inside the nodal component
"ground" and all of its nodes are constrained to ax=0. I checked
with development and we don't permit that for PML elements. To
represent the ground plane it is only necessary to constrain the
nodes at the surface z = -105.

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