System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at OpenRA.Graphics.SequenceProvider.HasSequence(String unit, String seq)
   at OpenRA.Graphics.Animation.HasSequence(String seq)
   at OpenRA.Mods.RA.RenderInfantryProne.NormalizeInfantrySequence(Actor self, String baseSequence)
   at OpenRA.Mods.RA.Render.RenderInfantry..ctor(Actor self, RenderInfantryInfo info)
   at OpenRA.Mods.RA.RenderInfantryProneInfo.Create(ActorInitializer init)
   at OpenRA.Actor..ctor(World world, String name, TypeDictionary initDict)
   at OpenRA.World.CreateActor(Boolean addToWorld, String name, TypeDictionary initDict)
   at OpenRA.Mods.RA.Production.DoProduction(Actor self, ActorInfo producee, ExitInfo exitinfo)
   at OpenRA.Mods.RA.Production.Produce(Actor self, ActorInfo producee)
   at OpenRA.Mods.RA.ClassicProductionQueue.BuildUnit(String name)
   at OpenRA.Mods.RA.ProductionQueue.<ResolveOrder>c__AnonStorey124.<>m__2D8(World _)
   at OpenRA.World.Tick()
   at OpenRA.Game.Tick(OrderManager orderManager)
   at OpenRA.Game.Tick(OrderManager orderManager, Viewport viewPort)
   at OpenRA.Game.Run()
   at OpenRA.Program.Run(String[] args)
   at OpenRA.Program.Main(String[] args)