The only mods I have active are this mod and its prerequisites, on top of the base game and all DLCs,Cannot proceed after picking any scenario.

this is the error log:
Exception filling window for RimWorld.Page_SelectScenario: System.NullReferenceException: Object reference not set to an instance of an object
[Ref 3146AE24]
at Verse.GenTypes.SameOrSubclassOf (System.Type baseType, System.Type parentType) [0x00009] in <cb53cd4422904947932d33f561ad8d15>:0
at Verse.GenTypes.SameOrSubclassOf[T] (System.Type baseType) [0x00000] in <cb53cd4422904947932d33f561ad8d15>:0
at RimWorld.ReadingPolicyDatabase.GenerateStartingPolicies () [0x0003e] in <cb53cd4422904947932d33f561ad8d15>:0
<0x27d01e30d60 + 0x0007a> <unknown method>
<0x27d01e27ef0 + 0x006ca> <unknown method>
at RimWorld.Page_SelectScenario.BeginScenarioConfiguration (RimWorld.Scenario scen, RimWorld.Page originPage) [0x00005] in <cb53cd4422904947932d33f561ad8d15>:0
at RimWorld.Page_SelectScenario.CanDoNext () [0x00014] in <cb53cd4422904947932d33f561ad8d15>: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 <cb53cd4422904947932d33f561ad8d15>:0
at RimWorld.Page_SelectScenario.DoWindowContents (UnityEngine.Rect rect) [0x000ab] in <cb53cd4422904947932d33f561ad8d15>:0
at Verse.Window.InnerWindowOnGUI (System.Int32 x) [0x001a6] in <cb53cd4422904947932d33f561ad8d15>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)