Help with this wierd Exception?

I have this error on my server when i log in?
Anyone what i can do to it?

HTML:

23.02 15:15:48 [Server] ERROR This crash report has been saved to: /./crash-reports/crash-2014-02-23_15.15.48-server.txt
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:453) [craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:541) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:590) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:30) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:287) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:179) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:61) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.Chunk.a(Chunk.java:817) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:228) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at org.bukkit.craftbukkit.v1_7_R1.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:49) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.ChunkProviderGenerate.getChunkAt(SourceFile:432) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.BiomeBigHills.a(SourceFile:42) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.BiomeBase.a(SourceFile:362) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.BiomeDecorator.a(SourceFile:27) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at net.minecraft.server.v1_7_R1.BiomeDecorator.a(SourceFile:183) ~[craftbukkit172.jar:git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks]
23.02 15:15:48 [Server] INFO at java.util.Random.nextInt(Unknown Source) ~[?:1.7.0_21]
23.02 15:15:48 [Server] INFO java.lang.IllegalArgumentException: n must be positive
23.02 15:15:48 [Server] ERROR Encountered an unexpected exception

 

Make a test with a fresh map to see if it still crashes. Also, https://bukkit.atlassian.net/browse/BUKKIT-4930

 

zipfe
With an fresh map it works, but only that map. In single player, chrashes my minecraft!

 

What are your plugins? Also, have you seen this: https://bukkit.atlassian.net/browse/BUKKIT-5062