Bug: Issue with Assemblies

1. Using First Person Controller + Third Person Controller assets
2. 2019.1.0f2 / standard pipeline / OS X Mojave
3. Empty Manager windows.
4. Select a manager from the Tools menu
5. 4 errors appear in Console:

Code:
ReflectionTypeLoadException: Exception of type 'System.Reflection.ReflectionTypeLoadException' was thrown.
System.Reflection.Assembly.GetTypes () (at <1f0c1ef1ad524c38bbc5536809c46b48>:0)
Opsive.UltimateCharacterController.Editor.Managers.MainManagerWindow.BuildManagerItems () (at Assets/Opsive/UltimateCharacterController/Editor/Managers/MainManagerWindow.cs:357)
Opsive.UltimateCharacterController.Editor.Managers.MainManagerWindow.OnEnable () (at Assets/Opsive/UltimateCharacterController/Editor/Managers/MainManagerWindow.cs:306)
UnityEditor.EditorWindow:GetWindow(Boolean, String)
Opsive.UltimateCharacterController.Editor.Managers.MainManagerWindow:ShowWindow() (at Assets/Opsive/UltimateCharacterController/Editor/Managers/MainManagerWindow.cs:155)


Code:
1ef1ad524c38bbc5536809c46b48>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <1f0c1ef1ad524c38bbc5536809c46b48>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:345)
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:339)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:315)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean floatingWindow, System.Boolean isBottomTab) (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:373)
UnityEditor.DockArea.OldOnGUI () (at /Users/builduser/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 /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:278)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Code:
GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Code:
NullReferenceException: Object reference not set to an instance of an object
Opsive.UltimateCharacterController.Editor.Managers.MainManagerWindow.OnMenuGUI () (at Assets/Opsive/UltimateCharacterController/Editor/Managers/MainManagerWindow.cs:337)
Opsive.UltimateCharacterController.Editor.Managers.MainManagerWindow.OnGUI () (at Assets/Opsive/UltimateCharacterController/Editor/Managers/MainManagerWindow.cs:315)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <1f0c1ef1ad524c38bbc5536809c46b48>: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 <1f0c1ef1ad524c38bbc5536809c46b48>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <1f0c1ef1ad524c38bbc5536809c46b48>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:345)
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:339)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:315)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean floatingWindow, System.Boolean isBottomTab) (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:373)
UnityEditor.DockArea.OldOnGUI () (at /Users/builduser/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 /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:295)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:481)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent () (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:455)
UnityEngine.UIElements.UIR.ImmediateRenderer.Draw (UnityEngine.UIElements.UIR.DrawChainState dcs) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderers.cs:447)
UnityEngine.UIElements.UIR.UIRenderDevice.ContinueChain (UnityEngine.UIElements.UIR.RendererBase head, UnityEngine.UIElements.UIR.DrawChainState dcs, System.Boolean outerChainsWithMeshRenderer) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderDevice.cs:841)
UnityEngine.UIElements.UIR.UIRenderDevice.DrawChain (UnityEngine.UIElements.UIR.RendererBase head, UnityEngine.Rect viewport, UnityEngine.Matrix4x4 projection, UnityEngine.Texture atlas) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Renderer/UIRenderer/UIRenderDevice.cs:824)
UnityEngine.UIElements.UIRRepaintUpdater.DrawChain (UnityEngine.Rect topRect, UnityEngine.Matrix4x4 projection) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Renderer/UIRRepaintUpdater.cs:218)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Renderer/UIRRepaintUpdater.cs:190)
UnityEngine.UIElements.VisualTreeUpdater
 
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