Помогите Ошибка генерации

Помогите решить вот это

Спойлер

2012-06-28 12:53:04 [SEVERE] java.lang.ClassCastException: org.bukkit.craftbukkit.util.StructureGrowDelegate cannot be cast to net.minecraft.server.World
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.WorldGenForest.generate(WorldGenForest.java:49)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.BlockSapling.grow(BlockSapling.java:101)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.BlockSapling.a(BlockSapling.java:33)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.World.l(World.java:2060)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.World.doTick(World.java:1776)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
2012-06-28 12:53:04 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-06-28 12:53:04 [SEVERE] Unexpected exception
java.lang.ClassCastException: org.bukkit.craftbukkit.util.StructureGrowDelegate cannot be cast to net.minecraft.server.World
at net.minecraft.server.WorldGenForest.generate(WorldGenForest.java:49)
at net.minecraft.server.BlockSapling.grow(BlockSapling.java:101)
at net.minecraft.server.BlockSapling.a(BlockSapling.java:33)
at net.minecraft.server.World.l(World.java:2060)
at net.minecraft.server.World.doTick(World.java:1776)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

не очень понимаю, толи карта повреждена, толи генерация нового леса его не устраивает.

 

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Какие моды стоят?