got an error in startup after the recent aug 4 update

Could not resolve cross-reference to RimWorld.FactionDef named Cinder_PlayerFaction (wanter=permanentEnemyToEveryoneExcept)
Could not resolve cross-reference to RimWorld.FactionDef named Cinder_OutlanderCivil (wanter=permanentEnemyToEveryoneExcept)

Incompatibility with Mechanoid Upgrades? Sometime raids won't spawn units and I get this error:

Exception while generating pawn group: System.NullReferenceException: Object reference not set to an instance of an object
[Ref 83EF92E2]
at MU.UpgradeRestriction_RangedFighter.CommonalityFactor (Verse.Pawn mech) [0x0002a] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at MU.MechUpgradeDef.CommonalityFinal (Verse.Pawn mech) [0x00039] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at MU.MechUpgradeUtility+<>c__DisplayClass9_0.<UpgradeMech>b__0 (MU.MechUpgradeDef def) [0x0000d] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at System.Linq.Enumerable+WhereListIterator`1[TSource].ToList () [0x00017] in <08e4a20a710b4c49aa8710b78057029a>:0
at System.Linq.Enumerable.ToList[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x0001f] in <08e4a20a710b4c49aa8710b78057029a>:0
at MU.MechUpgradeUtility.UpgradeMech (Verse.Pawn mech, System.Int32 amount, System.Boolean generated) [0x00048] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at MU.MechUpgradeUtility.UpgradeMech (Verse.Pawn mech, System.Single percent, System.Boolean generated) [0x0001c] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at MU.Patch_GenerateUpgradedPawn.Postfix (Verse.PawnGenerationRequest request, Verse.Pawn& __result) [0x00125] in <b19c7620be1a428f84a1bd1aa7d3d564>:0
at Verse.PawnGenerator.GeneratePawn (Verse.PawnGenerationRequest request) [0x00216] in <1ff918a14d0c4d098426de9adcf142a1>:0
- PREFIX raceQuestPawn: Void raceQuestPawn.patch_PawnGenerator_GeneratePawn:Prefix(PawnGenerationRequest& request)
- PREFIX SmashPhil.VehicleFramework: Boolean Vehicles.Patch_Construction:GenerateVehiclePawn(PawnGenerationRequest request, Pawn& __result)
- POSTFIX MechanoidUpgradesPatch: Void MU.Patch_GenerateUpgradedPawn:Postfix(PawnGenerationRequest request, Pawn& __result)
- POSTFIX EventController_rQP: Void EventController_rQP.EventController_Work:Postfix_PawnGenerator_GeneratePawn(Pawn& __result)
- POSTFIX VFEPirates.Mod: Void VFEPirates.PawnGenerator_GeneratePawn_Patch:Postfix(Pawn __result)
- POSTFIX Fortified: Void Fortified.Patch_GeneratePawnTitle:Postfix(Pawn& __result)
- POSTFIX AOBA.Embergarden: Void Embergarden.PawnGeneratorPatch:Postfix(Pawn& __result)
at RimWorld.PawnGroupKindWorker_Normal.GeneratePawns (RimWorld.PawnGroupMakerParms parms, RimWorld.PawnGroupMaker groupMaker, System.Collections.Generic.List`1[T] outPawns, System.Boolean errorOnZeroResults) [0x0030b] in <1ff918a14d0c4d098426de9adcf142a1>:0
- POSTFIX StrongerEmpire: Void StrongerEmpire.Patch_PawnGroupKindWorker_GeneratePawns:Postfix(PawnGroupMakerParms parms, PawnGroupMaker groupMaker, List`1 outPawns, Boolean errorOnZeroResults)
- POSTFIX StrongerEmpire_Biotech: Void StrongerEmpire.Biotech.Biotech_Patch_PawnGroupKindWorker_GeneratePawns:Postfix(PawnGroupMakerParms parms, PawnGroupMaker groupMaker, List`1 outPawns, Boolean errorOnZeroResults)
at RimWorld.PawnGroupKindWorker.GeneratePawns (RimWorld.PawnGroupMakerParms parms, RimWorld.PawnGroupMaker groupMaker, System.Boolean errorOnZeroResults) [0x00041] in <1ff918a14d0c4d098426de9adcf142a1>:0
- PREFIX VFEInsectoidsMod: Boolean VFEInsectoids.PawnGroupKindWorker_GeneratePawns_Patch:Prefix(PawnGroupMakerParms parms, PawnGroupMaker groupMaker, List`1& __result)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.PawnGroupKindWorker.GeneratePawns_Patch1 (RimWorld.PawnGroupKindWorker,RimWorld.PawnGroupMakerParms,RimWorld.PawnGroupMaker,bool)
RimWorld.PawnGroupMaker:GeneratePawns (RimWorld.PawnGroupMakerParms,bool)
RimWorld.PawnGroupMakerUtility/<GeneratePawns>d__2:MoveNext ()
VFEInsectoids.PawnGroupMakerUtility_GeneratePawns/<Postfix>d__0:MoveNext ()
System.Collections.Generic.List`1<Verse.Pawn>:AddEnumerable (System.Collections.Generic.IEnumerable`1<Verse.Pawn>)
System.Collections.Generic.List`1<Verse.Pawn>:.ctor (System.Collections.Generic.IEnumerable`1<Verse.Pawn>)
System.Linq.Enumerable:ToList<Verse.Pawn> (System.Collections.Generic.IEnumerable`1<Verse.Pawn>)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.IncidentWorker_Raid.TryGenerateRaidInfo_Patch1 (RimWorld.IncidentWorker_Raid,RimWorld.IncidentParms,System.Collections.Generic.List`1<Verse.Pawn>&,bool)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.IncidentWorker_Raid.TryExecuteWorker_Patch2 (RimWorld.IncidentWorker_Raid,RimWorld.IncidentParms)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.IncidentWorker.TryExecute_Patch2 (RimWorld.IncidentWorker,RimWorld.IncidentParms)
Verse.DebugActionsIncidents:DoRaid (RimWorld.IncidentParms)
Verse.DebugActionsIncidents/<>c__DisplayClass4_0:<ExecuteRaidWithSpecifics>b__6 ()
LudeonTK.Dialog_DebugOptionLister:DebugAction (string,single,System.Action,bool)
LudeonTK.Dialog_DebugOptionListLister:DoListingItems (UnityEngine.Rect,single)
LudeonTK.Dialog_OptionLister:DoWindowContents (UnityEngine.Rect)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)

@Yame I dont know if this will work in the case of your modpack, but I recently encountered this error myself and when adding in the mod Embergarden in this series along with this mod, this error went away.

Could not resolve cross-reference to RimWorld.FactionDef named Cinder_OutlanderCivil (wanter=permanentEnemyToEveryoneExcept)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch2 (string)
Verse.DirectXmlCrossRefLoader:TryResolveDef<RimWorld.FactionDef> (string,Verse.FailMode,object)
Verse.DirectXmlCrossRefLoader/WantedRefForList`1<RimWorld.FactionDef>:TryResolve (Verse.FailMode)
Verse.DirectXmlCrossRefLoader/<>c__DisplayClass16_0:<ResolveAllWantedCrossReferences>b__0 (Verse.DirectXmlCrossRefLoader/WantedRef)
Verse.GenThreading/<>c__DisplayClass7_1`1<Verse.DirectXmlCrossRefLoader/WantedRef>:<ParallelForEach>b__0 (object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem ()
System.Threading.ThreadPoolWorkQueue:Dispatch ()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback ()

Could not resolve cross-reference to RimWorld.FactionDef named Cinder_PlayerFaction (wanter=permanentEnemyToEveryoneExcept)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch2 (string)
Verse.DirectXmlCrossRefLoader:TryResolveDef<RimWorld.FactionDef> (string,Verse.FailMode,object)
Verse.DirectXmlCrossRefLoader/WantedRefForList`1<RimWorld.FactionDef>:TryResolve (Verse.FailMode)
Verse.DirectXmlCrossRefLoader/<>c__DisplayClass16_0:<ResolveAllWantedCrossReferences>b__0 (Verse.DirectXmlCrossRefLoader/WantedRef)
Verse.GenThreading/<>c__DisplayClass7_1`1<Verse.DirectXmlCrossRefLoader/WantedRef>:<ParallelForEach>b__0 (object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem ()
System.Threading.ThreadPoolWorkQueue:Dispatch ()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback ()

Tried to use an uninitialized DefOf of type DMS_DefOf. DefOfs are initialized right after all defs all loaded. Uninitialized DefOfs will return only nulls. (hint: don't use DefOfs as default field values in Defs, try to resolve them in ResolveReferences() instead)
[Harmony, 0Harmony.dll] MonoMod.Utils.DynamicMethodDefinition.UnityEngine.StackTraceUtility.ExtractStackTrace_Patch1()
[Core, Assembly-CSharp.dll] Verse.Log.Warning(System.String text)
[Core, Assembly-CSharp.dll] RimWorld.DefOfHelper.EnsureInitializedInCtor(System.Type defOf)
[The Dead Man's Switch - AncientCorps, AncientCorps.dll] AncientCorps.DMS_DefOf..cctor()
[System, mscorlib.dll] System.Object.__icall_wrapper_mono_generic_class_init(System.IntPtr)
[The Dead Man's Switch - AncientCorps, AncientCorps.dll] AncientCorps.CompanyDef..ctor()

Hello, there is an error in the Ancient urban ruins mod in a minimal modlist when this mod is loaded. I have also let that mod know, as it is their mod which is erroring. Do you know if it is serious/can be fixed? Thank you for your work.

Error on line 419:
https://gist.github.com/HugsLibRecordKeeper/e82b05a2f1c799c818bbf0e8f4baabbe#file-output_log-txt-L419