Collab - History and CollabProxy errors in console.

1. What happened
Collab errors appear while using Unity. If cleared they will reappear if the window shifts focus or exiting play mode.

2. How we can reproduce it using the example you attached
- With Unity 2018.2.0f2 open the scene Test Scene_Dev
- Warnings appear in the console, clear the console
- Go into playmode
- Exit Playmode
NOTICE ISSUE: Error
System.TypeLoadException: Could not load type 'UnityEditor.Collaboration.ShowToolbarAtPositionDelegate' from assembly 'Unity.CollabProxy.Editor'.
UnityEditor.EditorAssemblies:ProcessInitializeOnLoadAttributes()

- Click outside of Unity
Notice issue: Warning
Cannot add menu item 'Window/Asset Management/Collab History' for method 'CollabHistoryWindow.ShowHistoryWindow' because a menu item with the same name already exists.

Errors appear in : 2018.2.0f2