Dear Theja Sai,
The warning regarding the changed reference values is not of a trouble itself (click on "Re-read reference values"). My concerns are about the red error messages you see in the background. Looks like the Motor-CAD executable could not be located (please, hover over the “Traceback most recent call” message to see the contents). Could you please check the path in the Motor-CAD GUI under “Defaults > Automation > ActiveX” and adjust it if needed; then re-execute the export procedure. Let us know about your findings.
Kindest regards — Oleg