Server crashes when players go far away!

I have a problem with my server. I fly far away, when i dont see the building, or when im on -900 then crash. Every time, i restart or reload or put another bukkit in it.
when we fly far away, the server crashed and send this error:

Code:

05.10 06:41:20 [Server] ERROR This crash report has been saved to: /./crash-reports/crash-2014-10-05_06.41.20-server.txt
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:459) [craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:548) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:250) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:597) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:34) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:347) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:188) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:51) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.Chunk.a(Chunk.java:840) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:246) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at org.bukkit.craftbukkit.v1_7_R2.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:49) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.ChunkProviderGenerate.getChunkAt(SourceFile:432) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.BiomeBase.a(SourceFile:364) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.BiomeDecorator.a(SourceFile:27) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at net.minecraft.server.v1_7_R2.BiomeDecorator.a(SourceFile:122) ~[craftbukkit-dev1.7.5.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3042jnks]
05.10 06:41:20 [Server] INFO at java.util.Random.nextInt(Random.java:388) ~[?:1.8.0_05]
05.10 06:41:20 [Server] INFO java.lang.IllegalArgumentException: bound must be positive
05.10 06:41:20 [Server] ERROR Encountered an unexpected exception
05.10 06:41:19 [Server] WARN Can't keep up! Did the system time change, or is the server overloaded? Running 2603ms behind, skipping 52 tick(s)

 

You Sir Need More RAM Or Have A Corrupted Chunk

 

mathrules4
I had a server with 512 mb. When i fly far away the server crashes.
When i have a server with 2gb, the server crashes again.
Doesnt matter how much ram i have, it says something about the chunks
Maybe someone else, that can solve my problem?

 

It would be awesome if you could paste your crash report.

 

DrPyroCupcake
Look above you.

 

05.10 06:41:20 [Server] ERROR This crash report has been saved to: /./crash-reports/crash-2014-10-05_06.41.20-server.txt

 

You have a corrupt chunk somewhere.

 

Alster551
What does that mean?
DrPyroCupcake
http://pastebin.com/DVPfZfU5
http://pastebin.com/SGPLPR4P

 

Not sure, Probably an error in the map.

 

As the others said there is corrupt chunk, I don't know why I didn't see that sooner. If you if you want to get rid of it looke at this.

 

Does it only happen when you fly a certain direction/to a certain spot, or does it happen no matter where you fly to?

If this happens when you are flying regardless where it could be that the server can't keep up with loading chunks to match your flying speed. If you think this might be the case try reducing the speed of which you are traveling to let the server catch up.