在建造螈学书架以后hchtung的右键菜单就用不了了，拆除以后也一样，红字
Exception in WorkGiverOptionProvider_WorkGivers.GetWorkGiversOptionsFor for Axolotl_ReadMoeLotlQiSkillBooks: System.NullReferenceException: Object reference not set to an instance of an object
[Ref 4D99F1BC] Duplicate stacktrace, see ref for original
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch3 (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.FloatMenuOptionProvider_WorkGivers+<GetWorkGiversOptionsFor>d__16.MoveNext_Patch1 (RimWorld.FloatMenuOptionProvider_WorkGivers/<GetWorkGiversOptionsFor>d__16)
RimWorld.FloatMenuOptionProvider_WorkGivers/<GetOptionsFor>d__14:MoveNext ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.FloatMenuMakerMap.GetProviderOptions_Patch1 (RimWorld.FloatMenuContext,System.Collections.Generic.List`1<Verse.FloatMenuOption>)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.FloatMenuMakerMap.GetOptions_Patch1 (System.Collections.Generic.List`1<Verse.Pawn>,UnityEngine.Vector3,RimWorld.FloatMenuContext&)
AchtungMod.MultiActions:AddColonist (AchtungMod.Colonist)
HarmonyLib.CollectionExtensions:Do<AchtungMod.Colonist> (System.Collections.Generic.IEnumerable`1<AchtungMod.Colonist>,System.Action`1<AchtungMod.Colonist>)
AchtungMod.MultiActions:.ctor (System.Collections.Generic.IEnumerable`1<AchtungMod.Colonist>,UnityEngine.Vector3)
AchtungMod.Controller:MouseDown (UnityEngine.Vector3,int,bool)
AchtungMod.Controller:HandleEvents ()
AchtungMod.Selector_SelectorOnGUI_Patch:Prefix ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.Selector.SelectorOnGUI_Patch1 (RimWorld.Selector)
RimWorld.MapInterface:HandleLowPriorityInput ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.UIRoot_Play.UIRootOnGUI_Patch1 (RimWorld.UIRoot_Play)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root.OnGUI_Patch2 (Verse.Root)
visual exceptions里的信息
Exception in RimWorld.FloatMenuOptionProvider_WorkGivers+<GetWorkGiversOptionsFor>d__16.MoveNext: System.NullReferenceException: Object reference not set to an instance of an object
[Ref 4D99F1BC]
at Axolotl.WorkGiver_ReadMoeLotlQiSkillBook+<>c__DisplayClass4_0.<PotentialWorkThingsGlobal>b__0 (Axolotl.MoeLotlSkillBook book) [0x0000b] in <d934c789d5dc4216b178d838395e65a8>:0
at System.Linq.Utilities+<>c__DisplayClass1_0`1[TSource].<CombinePredicates>b__0 (TSource x) [0x00000] in <1f993cbf88314b1baa1e10ca917bdc64>:0
at System.Linq.Enumerable+WhereEnumerableIterator`1[TSource].MoveNext () [0x00037] in <1f993cbf88314b1baa1e10ca917bdc64>:0
at System.Linq.Enumerable.Contains[TSource] (System.Collections.Generic.IEnumerable`1[T] source, TSource value, System.Collections.Generic.IEqualityComparer`1[T] comparer) [0x00033] in <1f993cbf88314b1baa1e10ca917bdc64>:0
at System.Linq.Enumerable.Contains[TSource] (System.Collections.Generic.IEnumerable`1[T] source, TSource value) [0x0000a] in <1f993cbf88314b1baa1e10ca917bdc64>:0
at RimWorld.FloatMenuOptionProvider_WorkGivers.ScannerShouldSkip (Verse.Pawn pawn, RimWorld.WorkGiver_Scanner scanner, Verse.Thing t) [0x00050] in <cb53cd4422904947932d33f561ad8d15>:0
- PREFIX net.pardeike.rimworld.mods.achtung: Boolean AchtungMod.FloatMenuOptionProvider_WorkGivers_ScannerShouldSkip_Patch:Prefix(WorkGiver_Scanner scanner, Thing t, Boolean& __result)
at RimWorld.FloatMenuOptionProvider_WorkGivers.GetWorkGiverOption (Verse.Pawn pawn, RimWorld.WorkGiverDef workGiver, Verse.LocalTargetInfo target, RimWorld.FloatMenuContext context) [0x000ab] in <cb53cd4422904947932d33f561ad8d15>:0
- TRANSPILER net.pardeike.rimworld.mods.achtung: IEnumerable`1 AchtungMod.FloatMenuOptionProvider_WorkGivers_GetWorkGiverOption_Patch:Transpiler(IEnumerable`1 instructions)
- PREFIX net.pardeike.rimworld.mods.achtung: Void AchtungMod.FloatMenuOptionProvider_WorkGivers_GetWorkGiverOption_Patch:Prefix(Pawn pawn, ForcedWork& __state)
- POSTFIX OskarPotocki.VEF: Void VEF.AnimalBehaviours.VanillaExpandedFramework_FloatMenuOptionProvider_WorkGivers_GetWorkGiverOption_Patch:NoWorkBesidesAttacks(Pawn pawn, FloatMenuOption& __result)
- POSTFIX net.pardeike.rimworld.mods.achtung: Void AchtungMod.FloatMenuOptionProvider_WorkGivers_GetWorkGiverOption_Patch:Postfix(Pawn pawn, ForcedWork __state)
at RimWorld.FloatMenuOptionProvider_WorkGivers+<GetWorkGiversOptionsFor>d__16.MoveNext () [0x00080] in <cb53cd4422904947932d33f561ad8d15>:0
- TRANSPILER net.pardeike.rimworld.lib.harmony: IEnumerable`1 VisualExceptions.ExceptionsAndActivatorHandler:Transpiler(IEnumerable`1 instructions, MethodBase original)