Question: How to linearize a dynamic system equation?

I need a help on the error message below as when I enter it on my browser the answer is that there isn't any hel for this subject.

Error Message:

Error, (in DynamicSystems:-EquilibriumPoint) the independent variable in the equations does not match the 'continuoustimevar' (t) specified by the DynamicSystems[SystemOptions].

Thank you!

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