error given at start of new game of fresh install

[sidfu]

Exception ticking VCcounter152172: System.ArgumentOutOfRangeException: Argument is out of range.
Parameter name: index
at System.Collections.Generic.List1[Combat_Realism.FireMode].get_Item (Int32 index) [0x00000] in <filename unknown>:0 at System.Linq.Enumerable.ElementAt[FireMode] (IEnumerable1 source, Int32 index) [0x00000] in :0
at Combat_Realism.CompFireModes.ResetModes () [0x00000] in :0
at Combat_Realism.Verb_ShootCR.Notify_EquipmentLost () [0x00000] in :0
at Verse.CompEquippable.Notify_EquipmentLost () [0x00000] in :0
at Verse.Pawn_EquipmentTracker.Remove (Verse.ThingWithComps eq) [0x00000] in :0
at Verse.Pawn_EquipmentTracker.DestroyEquipment (Verse.ThingWithComps eq) [0x00000] in :0
at Verse.Pawn_EquipmentTracker.DestroyAllEquipment (DestroyMode mode) [0x00000] in :0
at SK.Events.VillagerCorpsesGenerator.SpawnPawnCorpse (IntVec3 spawnCell, Verse.Map map, Verse.PawnKindDef pawnKindDef, RimWorld.Faction faction, Single rotProgressInTicks, Boolean removeEquipment) [0x00000] in :0
at SK.Events.VillagerCorpsesGenerator.GenerateVillagerCorpses () [0x00000] in :0
at SK.Events.VillagerCorpsesGenerator.Tick () [0x00000] in :0
at Verse.TickList.Tick () [0x00000] in :0
Verse.Log:Error(String)
Verse.TickList:Tick()
Verse.TickManager:DoSingleTick()
Verse.Game:m__729()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent()
Verse.LongEventHandler:LongEventsUpdate(Boolean&)
Verse.Root:Update()
Verse.Root_Play:Update()