Bug Weird glitch in Unity?

I tried to open an animator for my weapon, and the animator was invisible and I got this error:


NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Graphs.AnimationStateMachine.Graph.GenerateConnectionKey (UnityEditor.Graphs.Node srcNode, UnityEditor.Graphs.Node dstNode) (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimationStateMachine.Graph.GetEdgeInfo (UnityEditor.Graphs.Edge edge) (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimationStateMachine.EdgeGUI.DoEdges () (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimationStateMachine.GraphGUI.OnGraphGUI () (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimatorControllerTool.StateMachineView (UnityEngine.Rect position, System.Single zoomLevel) (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimatorControllerTool.DoGraph (UnityEngine.Rect graphRect, System.Single zoomLevel) (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimatorControllerTool.<SetupGUI>b__143_12 () (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimatorControllerTool.ScopedOnGUI (System.Action onGUIHandler) (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEditor.Graphs.AnimatorControllerTool.<SetupGUI>b__143_10 () (at <c9d804319889444480938d3c761b2e0a>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.IMGUIContainer.DoIMGUIRepaint () (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIR.RenderChainCommand.ExecuteNonDrawMesh (UnityEngine.UIElements.UIR.DrawParams drawParams, System.Single pixelsPerPoint, System.Exception& immediateException) (at <7096c6494db14f0c807ca461735e58a8>:0)
Rethrow as ImmediateModeException
UnityEngine.UIElements.UIR.RenderChain.Render () (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <7096c6494db14f0c807ca461735e58a8>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <89d2c0fe37e0454991daf2807b7dcb63>:0)


Anyone know what this means, and how to fix it? Any help would be extremely appreciated.

 

This specific error, coming from this location (eg, NOT your code, such as

UnityEditor.Graphs

), is often fixed by either Reset Layouts (upper right) or else Right-click Project, Reimport-All.

Otherwise, if it's your code, it's always the same:

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:
- Identify what is null <-- any other action taken before this step is WASTED TIME
- Identify why it is null
- Fix that