vuforia augmented reality with unity3d

@MohamedAya

i download Vuforia Core Samples and download last version vurforia sdk and i have Unity 2017.3.0b4 with vuforia and i use visual studio enterprise 2017 to edit scripts

what the solution for these errors

The type or namespace name 'ReconstructionBehaviour' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'PropBehaviour' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SurfaceBehaviour' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'ReconstructionBehaviour' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Prop' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Surface' could not be found (are you missing a using directive or an assembly reference?)