UnassignedReferenceException: The variable InOfferLabelObject of BuildingViewFramePW3 has not been assigned.
You probably need to assign the InOfferLabelObject variable of the BuildingViewFramePW3 script in the inspector.
BuildingFramePW3.SetVizualCategory () (at Assets/Scripts/Gui/Frames/PW3/BuildingFramePW3.cs:167)
BuildingFramePW3.SetPlacementStatus () (at Assets/Scripts/Gui/Frames/PW3/BuildingFramePW3.cs:141)
BuildingFramePW3.UpdateData () (at Assets/Scripts/Gui/Frames/PW3/BuildingFramePW3.cs:127)
BuildingFramePW3.SetData[LobbyBuildingCategoryData] (.LobbyBuildingCategoryData newData) (at Assets/Scripts/Gui/Frames/PW3/BuildingFramePW3.cs:114)
PlayerPersonalSpaceForm.UpdateBuildFrames[LobbyBuildingCategoryData] (System.Collections.Generic.List`1 data, IComparer`1 comparer) (at Assets/Scripts/Gui/Forms/PW3/PlayerPersonalSpaceForm.cs:1302)
PlayerPersonalSpaceForm.ShowBuildingCategory () (at Assets/Scripts/Gui/Forms/PW3/PlayerPersonalSpaceForm.cs:1232)
PlayerPersonalSpaceForm.ShowBuildPanel () (at Assets/Scripts/Gui/Forms/PW3/PlayerPersonalSpaceForm.cs:773)
PlayerPersonalSpaceForm.OpenForm (LobbyMenuButtonType buttonType) (at Assets/Scripts/Gui/Forms/PW3/PlayerPersonalSpaceForm.cs:722)
PlayerPersonalSpaceForm.OnLobbyMenuButtonClick (.LobbyMenuButtonFrame clickedFrame) (at Assets/Scripts/Gui/Forms/PW3/PlayerPersonalSpaceForm.cs:707)
LobbyMenuButtonFrame.OnMenuButtonClick () (at Assets/Scripts/Gui/Frames/LobbyMenuButtonFrame.cs:101)
UnityEngine.Events.InvokableCall.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:166)
UnityEngine.Events.UnityEvent.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent_0.cs:58)
UnityEngine.UI.Button.Press () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:36)
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:45)
UnityEngine.EventSystems.ExecuteEvents.Execute (IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[IPointerClickHandler] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:261)
UnityEngine.EventSystems.EventSystem:Update()