Error Log:

Exception in JobDriver tick for pawn Alice driver=JobDriver_ConstructFinishFrame (toilIndex=1) driver.job=(FinishFrame (Job_4071163) A=Thing_Frame_Building_Vertihawk518989) lastJobGiver=RimWorld.JobGiver_Work
System.ArgumentNullException: Argument cannot be null.
Parameter name: type
at System.Activator.CheckType (System.Type type) [0x00000] in <filename unknown>:0
at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0
at System.Activator.CreateInstance (System.Type type) [0x00000] in <filename unknown>:0
at Verse.ThingMaker.MakeThing (Verse.ThingDef def, Verse.ThingDef stuff) [0x00000] in <filename unknown>:0
at RimWorld.Frame.CompleteConstruction (Verse.Pawn worker) [0x00000] in <filename unknown>:0
at RimWorld.JobDriver_ConstructFinishFrame+<MakeNewToils>c__Iterator0+<MakeNewToils>c__AnonStorey1.<>m__1 () [0x00000] in <filename unknown>:0
at Verse.AI.JobDriver.DriverTick () [0x00000] in <filename unknown>:0
Verse.Log:Error(String, Boolean)
Verse.AI.JobUtility:TryStartErrorRecoverJob(Pawn, String, Exception, JobDriver)
Verse.AI.JobDriver:DriverTick()
Verse.AI.Pawn_JobTracker:JobTrackerTick()
Verse.Pawn:Tick()
Verse.TickList:Tick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:UpdatePlay()
Verse.Root_Play:Update()