I was trying to import the Vuforia Core Samples(for Used Defined Targets). There was an error due to which the script could not compile.
Assets/SamplesResources/VuforiaSamplesUI/Scripts/SamplesAboutScreenInfo.cs(77,58): error CS1061: Type `Vuforia.VuforiaRuntime' does not contain a definition for `InitializationState' and no extension method `InitializationState' of type `Vuforia.VuforiaRuntime' could be found. Are you missing an assembly reference?
What could the possible reason for this error be?
Unity Version: 2018.1.0f2
Any help would be appreciated.