When dragging any object/folder into the addressable Window: Code (CSharp): NullReferenceException: Object reference not set to an instance of an object UnityEditor.AddressableAssets.GUI.AddressableAssetEntryTreeView.HandleDragAndDrop (UnityEditor.IMGUI.Controls.TreeView+DragAndDropArgs args) (at Library/PackageCache/com.unity.addressables@1.1.4-preview/Editor/GUI/AddressableAssetsSettingsGroupTreeView.cs:1015) UnityEditor.IMGUI.Controls.TreeView+TreeViewControlDragging.DoDrag (UnityEditor.IMGUI.Controls.TreeViewItem parentItem, UnityEditor.IMGUI.Controls.TreeViewItem targetItem, System.Boolean perform, UnityEditor.IMGUI.Controls.TreeViewDragging+DropPosition dropPosition) (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewControl/TreeViewControlDragging.cs:41) UnityEditor.IMGUI.Controls.TreeViewDragging.DragElement (UnityEditor.IMGUI.Controls.TreeViewItem targetItem, UnityEngine.Rect targetItemRect, System.Int32 row) (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewDragging.cs:166) UnityEditor.IMGUI.Controls.TreeViewController.HandleUnusedEvents () (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewController.cs:826) UnityEditor.IMGUI.Controls.TreeViewController.OnGUI (UnityEngine.Rect rect, System.Int32 keyboardControlID) (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewController.cs:609) UnityEditor.IMGUI.Controls.TreeView.TreeViewWithMultiColumnHeader (UnityEngine.Rect rect) (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewControl/TreeViewControl.cs:438) UnityEditor.IMGUI.Controls.TreeView.OnGUI (UnityEngine.Rect rect) (at C:/buildslave/unity/build/Editor/Mono/GUI/TreeView/TreeViewControl/TreeViewControl.cs:412) UnityEditor.AddressableAssets.GUI.AddressableAssetEntryTreeView.OnGUI (UnityEngine.Rect rect) (at Library/PackageCache/com.unity.addressables@1.1.4-preview/Editor/GUI/AddressableAssetsSettingsGroupTreeView.cs:260) UnityEditor.AddressableAssets.GUI.AddressableAssetsSettingsGroupEditor.OnGUI (UnityEngine.Rect pos) (at Library/PackageCache/com.unity.addressables@1.1.4-preview/Editor/GUI/AddressableAssetsSettingsGroupEditor.cs:355) UnityEditor.AddressableAssets.GUI.AddressableAssetsWindow.OnGUI () (at Library/PackageCache/com.unity.addressables@1.1.4-preview/Editor/GUI/AddressableAssetsWindow.cs:135) System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <7d97106330684add86d080ecf65bfe69>: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 <7d97106330684add86d080ecf65bfe69>:0) System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <7d97106330684add86d080ecf65bfe69>:0) UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:335) UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:329) UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:305) UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean floatingWindow, System.Boolean isBottomTab) (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:373) UnityEditor.DockArea.OldOnGUI () (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:340) 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:295) UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:481) UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:464) UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:444) UnityEngine.UIElements.EventDispatchUtilities.PropagateEvent (UnityEngine.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/Events/IEventDispatchingStrategy.cs:64) UnityEngine.UIElements.MouseEventDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/Events/MouseEventDispatchingStrategy.cs:58) 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:189) UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:255) UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:78) UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179) I guess target is undefined: