Bug Difficulties with ProBuilder tool

Hello all, new to Unity and trying to use Probuilder. However for some reason when I try to open certain tool windows (for example the collapse vertices window) I get this error instead. I don't even know where to begin to parse this so any help is greatly appreciated. Apologies if this is the wrong place.


EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUIUtilityrocessEvent (int,intptr,bool&) (at /home/bokken/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)