mapbox -unity- sdk v2.1.1 ,mapbox with Unity problems

when ı tried to load mapbox -unity- sdk v2.1.1 to my project, I always got; 1-Assets\GoogleARCore\SDK\InstantPreview\Scripts\InstantPreviewManager.cs(32,23): error CS0234: The type or namespace name 'SpatialTracking' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?) 2-Assets\GoogleARCore\SDK\Scripts\ARCoreBackgroundRenderer.cs(43,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?) 3-Assets\UnityARInterface\ARRemote\Scripts\ARRemoteEditorInterface.cs(40,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?) 4- Assets\UnityARInterface\Scripts\ARCoreInterface.cs(51,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?) 5-Assets\UnityARInterface\Scripts\ARKitInterface.cs(26,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?) errors. I dont know why... can you please help me to solve these errors?,When ı tried to load mapbox SDK on Unity, ı always got; 1- "Assets\GoogleARCore\SDK\InstantPreview\Scripts\InstantPreviewManager.cs(32,23): error CS0234: The type or namespace name 'SpatialTracking' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)" 2-"Assets\GoogleARCore\SDK\Scripts\ARCoreBackgroundRenderer.cs(43,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?)" 3-"Assets\UnityARInterface\ARRemote\Scripts\ARRemoteEditorInterface.cs(40,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?)" 4-"Assets\UnityARInterface\Scripts\ARCoreInterface.cs(51,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?)" 5-"Assets\UnityARInterface\Scripts\ARKitInterface.cs(26,17): error CS0246: The type or namespace name 'ARBackgroundRenderer' could not be found (are you missing a using directive or an assembly reference?)" mistakes. ı have no idea why. Can you please help me to solve these problems.