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invariant_theory package

I am trying to follow the tutorial on the invariant_theory package:

I asked sage to execute the first example:

sage: R.<x,y> = QQ[]

sage: q = x^4 + y^4

sage: quartic = invariant_theory.binary_quartic(q); quartic

But received the following error: Traceback (click to the left of this block for traceback) ... NameError: name 'invariant_theory' is not defined

I have the newest version of sage installed. What's going wrong here?