ReferenceError: Error #1008 Class is ambiguous

I have a As3 file and I get a runtime error:

ReferenceError: **Error #1008**: Tooltip is ambiguous; Found more than one matching binding.

I have a class named Tooltip and also a symbol in library with linkage class: Tooltip and Base Class fv开发者_如何学运维g.Tooltip (fvg is the name of the package). Why I get this conflict?

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Fixed! I had to import the Tooltip class in my Document class file.