After response from Zemax support, I updated the versions of both OptiSlang and Optic Studio to 2022R1 and 22.2.1 respectively.

Created a new guided project from scratch, with ZEMAX module in OptiSlang and it works now.

Faced issuses with:


  1. Loading an old optislang “.opf” file and re-running the Zemax node did not solve the issue even after the installing the newer versions. A new project has to be created.
  2. The .zmx model have to be saved again with all the inputs(variables in the LDE) and responses(all operands in the MFE). The old .zmx file has to be overwritten. Just save does not work for some reason.