How do I fix Error 1017 in Flash/FlashDevelop using AS3?

I am working on a project with another person, and when I try to compile it, I get the error, 1017: The definition of base class Sprite was not found. The properties and settings are set exactly to how my other AS3/Starling projects are (of which, all work and compile properly). I am using FlashDevelop. Also, I am... show more I am working on a project with another person, and when I try to compile it, I get the error, 1017: The definition of base class Sprite was not found. The properties and settings are set exactly to how my other AS3/Starling projects are (of which, all work and compile properly). I am using FlashDevelop. Also, I am importing with import starling.display.Sprite;. What could the problem possibly be?
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