Summary: 21 warnings, 316 errors: No Library cache found - ALL assets will be re-imported. Are you missing a using directive or an assembly reference? This is the error it gives me from all scripts of vuforia Assets/Qualcomm Augmented Reality/Scripts/BackgroundPlaneBehaviour.cs(18,45): error CS0246: The type or namespace name `BackgroundPlaneAbstractBehaviour' could not be found. I tried compiling for iOS, but I get compilation errors all from Vuforia.