Question: Blank Equation Extraction of Op Amps in MapleSim

I am trying to extract the underlying equation for a simple operational amplifier circuit in MapleSim 5.  The same process that I had used earlier for a simple resistor circuit (without opamp) worked fine and yielded equations.  However, when I try to do the same thing with an opamp (configured to do a simple amplification of an input voltage) I get a blank "View Core Equations" box in the Equation Extraction attachment. 

 

Thanks!

 

James

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