I got his when I tried to elvolve weepingbell with a leaf stone:
Exception ticking PW_Weepinbell1420033 (at (152, 0, 181)): System.ArgumentException: An item with the same key has already been added. Key: PoisonJab
[Ref E7FEAF9A]
[0x00006] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x0015a] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in <51fded79cd284d4d911c5949aff4cb21>:0
at PokeWorld.MoveTracker.GetUnlockedMovesFromPreEvolution (PokeWorld.CompPokemon preEvoComp) [0x000c8] in <d8f9192884504997ba29aef0ec9876b5>:0
at PokeWorld.LevelTracker.Copy (Verse.Pawn pokemon, Verse.Pawn evolution) [0x000a8] in <d8f9192884504997ba29aef0ec9876b5>:0
at PokeWorld.LevelTracker.Evolve (System.Collections.Generic.List`1[T] kindDefs) [0x00042] in <d8f9192884504997ba29aef0ec9876b5>:0
at PokeWorld.LevelTracker.UpdateEvolutionProcess () [0x00071] in <d8f9192884504997ba29aef0ec9876b5>:0
at PokeWorld.LevelTracker.LevelTick () [0x00008] in <d8f9192884504997ba29aef0ec9876b5>:0
at PokeWorld.CompPokemon.CompTick () [0x00010] in <d8f9192884504997ba29aef0ec9876b5>:0
at Verse.ThingWithComps.Tick () [0x00025] in <24d25868955f4df08b02c73b55f389fe>:0
at Verse.Pawn.Tick () [0x0002c] in <24d25868955f4df08b02c73b55f389fe>:0
- POSTFIX jixuanming.mechfusion: Void MechFusion.StunOnMeleeIntentPatch:Postfix(Pawn __instance)
at Verse.Thing.DoTick () [0x0007b] in <24d25868955f4df08b02c73b55f389fe>:0
at Verse.TickList.Tick () [0x00139] in <24d25868955f4df08b02c73b55f389fe>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch3 (string)
Verse.TickList:Tick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch6 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.UpdatePlay_Patch3 (Verse.Game)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)