Hey there,
I just updated to 2018.3.13 on the latest MacOS macbook pro, and whenever I select the Timeline window, I get a ton of these errors. The timeline still works when I press Play, but the Timeline window stays blank so I can’t make any edits.
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Timeline.ScriptableObjectViewPrefs1[TViewModel].LoadViewModel () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/ViewModel/ScriptableObjectViewPrefs.cs:109) UnityEditor.Timeline.ScriptableObjectViewPrefs1[TViewModel].get_viewModel () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/ViewModel/ScriptableObjectViewPrefs.cs:52)
UnityEditor.Timeline.TimelineWindowViewPrefs.GetOrCreateViewModel (UnityEngine.Timeline.TimelineAsset asset) (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/ViewModel/TimelineWindowViewPrefs.cs:25)
UnityEditor.Timeline.SequenceState.get_viewModel () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/State/SequenceState.cs:38)
UnityEditor.Timeline.WindowState.get_timeAreaShownRange () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/State/WindowState.cs:515)
UnityEditor.Timeline.TimelineWindow.SyncTimeAreaShownRange () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/TimelineWindow_TimeArea.cs:70)
UnityEditor.Timeline.TimelineWindow.InitializeTimeArea () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/TimelineWindow_TimeArea.cs:40)
UnityEditor.Timeline.TimelineWindow.InitializeGUIIfRequired () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/TimelineWindow.cs:338)
UnityEditor.Timeline.TimelineWindow.OnGUI () (at /Users/builduser/buildslave/unity/build/Extensions/Timeline/Editor/Window/TimelineWindow.cs:177)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at :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 :0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[ ] parameters) (at :0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:342)
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:336)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:310)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean customBorder, System.Boolean floatingWindow, System.Boolean isBottomTab) (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:361)
UnityEditor.DockArea.OldOnGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:320)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:244)
UnityEngine.GUIUtility:processEvent(Int32, IntPtr)