spice model generator ads

Dear all,

A standard *.s28p failed to translate into SPICE model using ADS2003C -SPICE model generator. However, a standard *.snp, where n<10, can be translate correctly into SPICE model using ADS2003C -SPICE model generator.
I checked the ADS manual, it stated that the SPICE model generator can translate the touchstone file into SPICE model from 1 port to 99 ports touchstone file.

Could anyone here tell me what is going on with this?
Thanks ! ~~

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