CST cannot export S-parameters data

Hi! Everyone!
After I simulated, I want to remove higher mode from ports by Exclude port mode in Post Processing,then exported S parameters. But CST appeared message:
Export S parameters data failed.
My model is APC-7 coax air transmission line, and the middle part is Teflon.
What is the problem? Thanks.

I have following questions to understand your problem better
1. Which solver of CST you are using?
2.What S parameters data will be left when you say exclude port mode as per my understanding S parameters are calculated at ports. So when you exclude ports nothing is left to be exported so it is the error in post processing

I choice Frequency domain solver as solver.
Oh, I see! However I want to remove higher mode from ports so that S-parameters results don't include effect from my 2-ports measurement.
Is there other method to remove effects caused by ports?