Hi! I am getting this error whenever I'm trying to create a new world with Spirit Mod!

[11:42:43.835] [.NET ThreadPool Worker/ERROR] [tML]: SpiritMod/MyWorld : A problem was encountered during world generation
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
at System.Collections.Generic.List`1.RemoveAt(Int32 index)
at Terraria.ModLoader.SystemLoader.ModifyWorldGenTasks(List`1 passes, Single& totalWeight) in tModLoader\Terraria\ModLoader\SystemLoader.cs:line 383
[11:42:43.838] [.NET ThreadPool Worker/ERROR] [Terraria]: A problem was encountered during world generation
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
at System.Collections.Generic.List`1.RemoveAt(Int32 index)
at Terraria.ModLoader.SystemLoader.ModifyWorldGenTasks(List`1 passes, Single& totalWeight) in tModLoader\Terraria\ModLoader\SystemLoader.cs:line 383
at Terraria.WorldGen.GenerateWorld(Int32 seed, GenerationProgress customProgressObject) in tModLoader\Terraria\WorldGen.cs:line 12384
at Terraria.WorldGen.do_worldGenCallBack(Object threadContext) in tModLoader\Terraria\WorldGen.cs:line 2345
at Terraria.WorldGen.worldGenCallback(Object threadContext) in tModLoader\Terraria\WorldGen.cs:line 2335
[11:42:53.658] [Main Thread/DEBUG] [tML]: Process.Start (UseShellExecute = True): "tModLoader-Logs"