Scenerio Error Log 1.6 [LTS]Biosphere

Exception filling window for RimWorld.Page_SelectScenario: System.NullReferenceException: Object reference not set to an instance of an object
[Ref F08AD81E]
  at Verse.GenTypes.SameOrSubclassOf (System.Type baseType, System.Type parentType) [0x00009] in <9728206c9b9d48e9b64ef805eb756941>:0
  at Verse.GenTypes.SameOrSubclassOf[T] (System.Type baseType) [0x00000] in <9728206c9b9d48e9b64ef805eb756941>:0
  at RimWorld.ReadingPolicyDatabase.GenerateStartingPolicies () [0x0003e] in <9728206c9b9d48e9b64ef805eb756941>:0
<0x2abb823d9a0 + 0x0007a> <unknown method>
<0x2abb8234c60 + 0x006ca> <unknown method>
  at RimWorld.Page_SelectScenario.BeginScenarioConfiguration (RimWorld.Scenario scen, RimWorld.Page originPage) [0x00005] in <9728206c9b9d48e9b64ef805eb756941>:0
  at RimWorld.Page_SelectScenario.CanDoNext () [0x00014] in <9728206c9b9d48e9b64ef805eb756941>:0
  at RimWorld.Page.DoBottomButtons (UnityEngine.Rect rect, System.String nextLabel, System.String midLabel, System.Action midAct, System.Boolean showNext, System.Boolean doNextOnKeypress) [0x000f2] in <9728206c9b9d48e9b64ef805eb756941>:0
  at RimWorld.Page_SelectScenario.DoWindowContents (UnityEngine.Rect rect) [0x000ab] in <9728206c9b9d48e9b64ef805eb756941>:0
  at Verse.Window.InnerWindowOnGUI (System.Int32 x) [0x001a6] in <9728206c9b9d48e9b64ef805eb756941>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)