半炒抄半写的代码，也不懂错在哪🙄

threw exception while determining job (main)
System.NullReferenceException: Object reference not set to an instance of an object
at Verse.AI.Pawn_Thinker.get_MainThinkNodeRoot () [0x0000b] in <d72310b4d8f64d25aee502792b58549f>:0
at (wrapper dynamic-method) Verse.AI.Pawn_JobTracker.Verse.AI.Pawn_JobTracker.DetermineNextJob_Patch4(Verse.AI.Pawn_JobTracker,Verse.ThinkTreeDef&)
Verse.Log:Error(String, Boolean)
Verse.AI.JobUtility:TryStartErrorRecoverJob(Pawn, String, Exception, JobDriver)
Verse.AI.Pawn_JobTracker:Verse.AI.Pawn_JobTracker.DetermineNextJob_Patch4(Pawn_JobTracker, ThinkTreeDef&)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob()
Verse.AI.Pawn_JobTracker:Verse.AI.Pawn_JobTracker.EndCurrentJob_Patch1(Pawn_JobTracker, JobCondition, Boolean, Boolean)
Verse.AI.Pawn_JobTracker:JobTrackerTick()
Verse.Pawn:Verse.Pawn.Tick_Patch1(Pawn)
Verse.TickList:Tick()
Verse.TickManager:Verse.TickManager.DoSingleTick_Patch1(TickManager)
Verse.TickManager:TickManagerUpdate()
Verse.Game:V