Model Order Reduction (MOR) in CST

Hey
I am working on a filter in CST(2-ports system), I calculated all S-parameters (in a Post Processing Template), and when I try to perform MOR, I get a message box 'Not all Result Files are present, please perform a simulation where all ports are excited'

although the tutorial states, that for MOR calculation you need to have already calculated S-matrix, and I believe I already calculated it since I calculated all S parameters.
Can someone please help me in this regards

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