Problem Server keeps crashing

[iProBrown]

Hello,

Every time that I try to start the server the server crashes directly when it has to start running. I haven't changed any settings. The computer I use to run the server is Linux, but I have downloaded the proper server file. This is the error I get:

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!
 
Time: 2/26/13 1:01 PM
Description: Exception in server tick loop
 
java.lang.ArrayIndexOutOfBoundsException: -5
    at aaa.a(SourceFile:47)
    at zz.a(Chunk.java:715)
    at zz.a(Chunk.java:663)
    at yc.b(World.java:591)
    at yc.e(World.java:700)
    at thaumcraft.common.world.WorldGenHilltopStones.a(WorldGenHilltopStones.java:95)
    at thaumcraft.common.world.ThaumcraftWorldGenerator.generateSurface(ThaumcraftWorldGenerator.java:172)
    at thaumcraft.common.world.ThaumcraftWorldGenerator.worldGeneration(ThaumcraftWorldGenerator.java:41)
    at thaumcraft.common.world.ThaumcraftWorldGenerator.generate(ThaumcraftWorldGenerator.java:29)
    at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:91)
    at im.a(ChunkProviderServer.java:259)
    at zz.a(Chunk.java:1258)
    at im.c(ChunkProviderServer.java:153)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:310)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:284)
    at ho.c(DedicatedServer.java:180)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
    at fy.run(SourceFile:849)

I kept the detailed information out because that makes this post more than 10.000 words, if that is neccesery I can send it in an alternative way. I hope that there is somebody that knows how to solve this problem.
Thanks!

 

[iProBrown]

Sorry, we are also using the latest Mindcrack Feed the Beast modpack without any mods added, the server specs are: quad core 3ghz, 50 gb space 8 gb ram