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'ITrackableEventHandler' could not be found.

Hey guys!I am upgrading an old vuforia project to unity 5 and vuforia 4.0. I have everything imported but now all of my scripts that are using the class ITrackableEventHandler are throwing the error CS0246: The type or namespace name 'ITrackableEventHandler' could not be found. Are you missing a using directive or assembly reference."Was this class removed in vuforia 4.0?