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ITrackableEventHandler and RegisterTrackableEventHandler error

By freedom667 on Wed, 08/19/2020 - 11:14

I updated Vuforia to 9.3.3 but giving this errors why?

Assets/Scripts/***.cs(5,47): error CS0246: The type or namespace name 'ITrackableEventHandler' could not be found (are you missing a using directive or an assembly reference?)

Assets/Scripts/***.cs(16,33): error CS1061: 'TrackableBehaviour' does not contain a definition for 'RegisterTrackableEventHandler' and no accessible extension method 'RegisterTrackableEventHandler' accepting a first argument of type 'TrackableBehaviour' could be found (are you missing a using directive or an assembly reference?)