Zopt error in ADS 2016

hi

I decided to design a LNA in ADS 2016. so placed a S2P blocked and add a transistor s2p file in this block.then I placed a Zopt block to calculate Z optimum for minimum noise figure.the result for S_parameters and stab fact was good but I have a warning about Zopt block so that ADS can not calculate this parameter :

" Warning detected by hpeesofsim during circuit set up. Unable to resolve variable(s) or functions(s) in expression ` Zopt1=zopt(Sopt,PortZ1)' Sopt "

please help me to solve this problem .

Zopt is not computed from ordinary s-parameters, instead Zopt (and the other parameters) is given in s-parameters file as measured quantities or worse method is to use a nonlinear model of the transistor but Zopt ( and others) will not be very accurate.

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