Question: how do I create a custom component for throttle area in engine modeling?

I'm learning maplesim 4.5 for my project. I need to create a custom component for throttle area in engine modeling?

when I created I faced an error  like  'invalid input: Modelica expects value for keyword parameter parameters to be of type list (name =realcons)'

 

please suggest me to create the custom component. . .

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