=First Error=
Failed to find Verse.ThingDef named IGArvusLighterGrey_Active. There are 8079 defs of this type loaded.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.DefDatabase`1<Verse.ThingDef>:GetNamed (string,bool)
Verse.ThingDef:Named (string)
SRTS.CompLaunchableSRTS:TryLaunch (int,RimWorld.Planet.TransportPodsArrivalAction,RimWorld.Planet.Caravan)
SRTS.SRTSArrivalActionUtility/<>c__DisplayClass0_0`1<RimWorld.Planet.TransportPodsArrivalAction_VisitSettlement>:<GetFloatMenuOptions>b__0 ()
Verse.FloatMenuOption:Chosen (bool,Verse.FloatMenu)
Verse.FloatMenuOption:DoGUI (UnityEngine.Rect,bool,Verse.FloatMenu)
Verse.FloatMenu:DoWindowContents (UnityEngine.Rect)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)

=Successive/Second Error=
Exception filling window for Verse.FloatMenu: System.NullReferenceException: Object reference not set to an instance of an object
  at Verse.ThingMaker.MakeThing (Verse.ThingDef def, Verse.ThingDef stuff) [0x00043] in <81af9f8a18324e17b286924a43555a7c>:0
  at SRTS.CompLaunchableSRTS.TryLaunch (System.Int32 destinationTile, RimWorld.Planet.TransportPodsArrivalAction arrivalAction, RimWorld.Planet.Caravan cafr) [0x001e7] in <2fd0c915241d4a7ca93b3cbf4df60a2d>:0
  at SRTS.SRTSArrivalActionUtility+<>c__DisplayClass0_0`1[T].<GetFloatMenuOptions>b__0 () [0x00030] in <2fd0c915241d4a7ca93b3cbf4df60a2d>:0
  at Verse.FloatMenuOption.Chosen (System.Boolean colonistOrdering, Verse.FloatMenu floatMenu) [0x00030] in <81af9f8a18324e17b286924a43555a7c>:0
  at Verse.FloatMenuOption.DoGUI (UnityEngine.Rect rect, System.Boolean colonistOrdering, Verse.FloatMenu floatMenu) [0x003b1] in <81af9f8a18324e17b286924a43555a7c>:0
  at Verse.FloatMenu.DoWindowContents (UnityEngine.Rect rect) [0x000fb] in <81af9f8a18324e17b286924a43555a7c>:0
  at Verse.Window.InnerWindowOnGUI (System.Int32 x) [0x001d3] in <81af9f8a18324e17b286924a43555a7c>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)