Momentum/Dynamic Link/GoldenGate Errors with Cadence Virtuoso

Hello,

I am running Cadence Virtuoso 1.6.4 with Agilent/Keysight ADS 2011 with Dynamic Link/Golden Gate tools for running Agilent/Keysight Momentum simulations with Cadence Layouts in Virtuoso.

With certain substrate files I get the following errors:

"Error writing Momentum Port File"
"Please specify Momentum Ports"
3D viewer not started: the project files could not be created

I also get the error - attached - when I start the 3D viewer.

Does anyone know what this means or how to fix it ?

Thank you.