I think your 1.2 support went south.
Tested on 1.2 with only the dependencies.
Plopped a light. Got the first exception
Clicked your button. Got the second exception.

Here, go feed some alphabeavers with them or something ;P

Initializing new game with mods:
- brrainz.harmony
- Ludeon.RimWorld
- hatena.HumanSensor
Verse.Log:Message(String, Boolean)
Verse.Game:InitNewGame()
Verse.<>c:<Start>b__1_2()
Verse.LongEventHandler:RunEventFromAnotherThread(Action)
Verse.<>c:<UpdateCurrentAsynchronousEvent>b__27_0()
System.Threading.ThreadHelper:ThreadStart_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object)
System.Threading.ThreadHelper:ThreadStart()

Root level exception in OnGUI(): System.MissingMethodException: Verse.TraverseParms Verse.TraverseParms.For(Verse.TraverseMode,Verse.Danger,bool,bool,bool)
at HumanSensor.CompSensorArea.PostSpawnSetup (System.Boolean respawningAfterLoad) [0x0000d] in <d5cc4b11ba6b4db488bc83cb20e48ffb>:0
at Verse.ThingWithComps.SpawnSetup (Verse.Map map, System.Boolean respawningAfterLoad) [0x00020] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at Verse.Building.SpawnSetup (Verse.Map map, System.Boolean respawningAfterLoad) [0x00054] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at Verse.GenSpawn.Spawn (Verse.Thing newThing, Verse.IntVec3 loc, Verse.Map map, Verse.Rot4 rot, Verse.WipeMode wipeMode, System.Boolean respawningAfterLoad) [0x00265] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at RimWorld.Designator_Build.DesignateSingleCell (Verse.IntVec3 c) [0x00092] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at Verse.DesignatorManager.ProcessInputEvents () [0x00058] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at RimWorld.MapInterface.HandleMapClicks () [0x0000f] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at RimWorld.UIRoot_Play.UIRootOnGUI () [0x00089] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at Verse.Root.OnGUI () [0x0003d] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
Verse.Log:Error(String, Boolean)
Verse.Root:OnGUI()

System.MissingMethodException: void Verse.Dialog_Slider..ctor(System.Func`2<int, string>,int,int,System.Action`1<int>,int,single)
at Verse.GizmoGridDrawer.DrawGizmoGrid (System.Collections.Generic.IEnumerable`1[T] gizmos, System.Single startX, Verse.Gizmo& mouseoverGizmo) [0x0062a] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
at RimWorld.InspectGizmoGrid.DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1[T] selectedObjects, Verse.Gizmo& mouseoverGizmo) [0x00209] in <12a8d1a0a5a64eae86579edb3a3b30c7>:0
Verse.Log:Error(String, Boolean)
Verse.Log:ErrorOnce(String, Int32, Boolean)
RimWorld.InspectGizmoGrid:DrawInspectGizmoGridFor(IEnumerable`1, Gizmo&)
RimWorld.MainTabWindow_Inspect:DrawInspectGizmos()
RimWorld.InspectPaneUtility:ExtraOnGUI(IInspectPane)
RimWorld.MainTabWindow_Inspect:ExtraOnGUI()
Verse.WindowStack:WindowStackOnGUI()
RimWorld.UIRoot_Play:UIRootOnGUI()
Verse.Root:OnGUI()