Originally posted by Alleyballey:

I've experienced this error a couple of times and was wondering if one of the framework mods I have enabled was possibly causing a incompatibility or if this was actually an issue. If this is me, fair enough. If its fixable, very cool B)

Modlist:
All dlcs
Character Editor
Camera+
Big and Small - Framework
Vanilla Expanded Framework
EBSG Framework
XML Patch Helper
XML Extensions
Humanoid Alien Races
Gene Tools - Forked
[AB]Xenotype: Yautja

Circumstances leading up to the error:
All colonists down and the chance for a man in black/woman in blue to appear

Error:
Failed to find RimWorld.IncidentDef named BS_WomanInBlueJoin. There are 132 defs of this type loaded.

UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.DefDatabase`1<RimWorld.IncidentDef>:GetNamed (string,bool)
BigAndSmall.TryExecuteWorker:Postfix (Verse.Pawn,RimWorld.IncidentWorker_WandererJoin) (at C:/Games/Steam/steamapps/common/RimWorld/Mods/1 BigSmall_Framework/1.6/Base/Source/BigSmallFramework/Misc/MiscPatches.cs:254)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.IncidentWorker_WandererJoin.GeneratePawn_Patch2 (RimWorld.IncidentWorker_WandererJoin)
RimWorld.IncidentWorker_WandererJoin:TryExecuteWorker (RimWorld.IncidentParms)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.IncidentWorker.TryExecute_Patch1 (RimWorld.IncidentWorker,RimWorld.IncidentParms)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.Storyteller.TryFire_Patch1 (RimWorld.Storyteller,RimWorld.FiringIncident,bool)
RimWorld.IncidentQueue:IncidentQueueTick ()
RimWorld.Storyteller:StorytellerTick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch1 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.UpdatePlay_Patch1 (Verse.Game)
Verse.Root_Play:Update ()