NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Experimental.TerrainAPI.PaintContext+<ScatterAlphamap>c__AnonStorey3.<>m__0 (UnityEngine.Experimental.TerrainAPI.PaintContext+ITerrainInfo t) (at C:/buildslave/unity/build/Modules/Terrain/Public/PaintContext.cs:524)
UnityEngine.Experimental.TerrainAPI.PaintContext.ScatterInternal (System.Func`2[T,TResult] terrainToRT, System.String operationName, UnityEngine.Material blitMaterial, System.Int32 blitPass, System.Action`1[T] beforeBlit, System.Action`1[T] afterBlit) (at C:/buildslave/unity/build/Modules/Terrain/Public/PaintContext.cs:321)
UnityEngine.Experimental.TerrainAPI.PaintContext.ScatterAlphamap (System.String editorUndoName) (at C:/buildslave/unity/build/Modules/Terrain/Public/PaintContext.cs:500)
UnityEngine.Experimental.TerrainAPI.TerrainPaintUtility.EndPaintTexture (UnityEngine.Experimental.TerrainAPI.PaintContext ctx, System.String editorUndoName) (at C:/buildslave/unity/build/Modules/Terrain/Public/TerrainPaintUtility.cs:187)
UnityEditor.Experimental.TerrainAPI.BrushRenderWithTerrainUiGroup.Release (UnityEngine.Experimental.TerrainAPI.PaintContext paintContext) (at Library/PackageCache/com.unity.terrain-tools@2.0.2-preview/Editor/TerrainTools/BrushControllers/BrushRenderWithTerrainUiGroup.cs:121)
UnityEditor.Experimental.TerrainAPI.BrushRenderWithTerrainUiGroup.Dispose () (at Library/PackageCache/com.unity.terrain-tools@2.0.2-preview/Editor/TerrainTools/BrushControllers/BrushRenderWithTerrainUiGroup.cs:148)
UnityEditor.Experimental.TerrainAPI.BaseBrushRenderUIGroupUnderCursor`1[TBase].Dispose () (at Library/PackageCache/com.unity.terrain-tools@2.0.2-preview/Editor/TerrainTools/BrushControllers/BrushRenderUIGroupUnderCursor.cs:104)
UnityEditor.Experimental.TerrainAPI.PaintTextureTool.OnPaint (UnityEngine.Terrain terrain, UnityEditor.Experimental.TerrainAPI.IOnPaint editContext) (at Library/PackageCache/com.unity.terrain-tools@2.0.2-preview/Editor/TerrainTools/PaintTextureTool.cs:246)
UnityEditor.TerrainInspector.OnSceneGUICallback (UnityEditor.SceneView sceneView) (at C:/buildslave/unity/build/Modules/TerrainEditor/TerrainInspector.cs:2163)
UnityEditor.SceneView.CallOnSceneGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneView.cs:3488)
UnityEditor.SceneView.HandleSelectionAndOnSceneGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneView.cs:2721)
UnityEditor.SceneView.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneView.cs:2428)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <23c160f925be47d7a4fd083a3a62c920>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <23c160f925be47d7a4fd083a3a62c920>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <23c160f925be47d7a4fd083a3a62c920>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:355)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:349)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:325)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:393)
UnityEditor.DockArea.OldOnGUI () (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:359)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:297)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:492)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:475)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:465)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:446)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:93)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:280)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:156)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/Panel.cs:209)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:289)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:107)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)