Build or minecraft version doesn't mater it's always like this.

hey guys I was switching from the default to craftbukkit and while I use the map generated in the official mc server I keep getting this error.
I can connect but the server laggs and eventualy crashes. This is the map as if I use another map or re-generate a new one there is no problem at all.
Using ubuntu x64 4 gig ram

Error:

Code:

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04:37:31 [SEVERE]       at net.minecraft.server.World.entityJoinedWorld(World.java:1198)
04:37:31 [SEVERE]       at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:48)
04:37:31 [SEVERE]       at net.minecraft.server.World.playerJoinedWorld(World.java:1180)
04:37:31 [SEVERE]       at net.minecraft.server.World.cleanUp(World.java:1104)
04:37:31 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:447)
04:37:31 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
04:37:31 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
04:37:31 [INFO] Chunk (-19, 8) stored at  (-6, 5)World
04:37:31 [INFO] net.minecraft.server.Chunkserver.World
04:37:31 [SEVERE] java.lang.Throwableraft.server.World
04:37:31 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProviderServer.java:124)
04:37:31 [SEVERE]       at net.minecraft.server.World.getChunkAt(World.java:274)
04:37:31 [SEVERE]       at net.minecraft.server.World.getTypeId(World.java:221)
04:37:31 [SEVERE]       at net.minecraft.server.World.getMaterial(World.java:315)
04:37:31 [SEVERE]       at net.minecraft.server.EntityItem.m_(EntityItem.java

another part of it :

Code:

04:41:58 [SEVERE]       at net.minecraft.server.World.getChunkAt(World.java:274)
04:41:58 [SEVERE]       at net.minecraft.server.World.getTypeId(World.java:221)
04:41:58 [SEVERE]       at net.minecraft.server.World.getMaterial(World.java:315)
04:41:58 [SEVERE]       at net.minecraft.server.EntityItem.m_(EntityItem.java:56)
04:41:58 [SEVERE]       at net.minecraft.server.World.entityJoinedWorld(World.java:1198)
04:41:58 [SEVERE]       at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:48)
04:41:58 [SEVERE]       at net.minecraft.server.World.playerJoinedWorld(World.java:1180)
04:41:58 [SEVERE]       at net.minecraft.server.World.cleanUp(World.java:1104)
04:41:58 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:447)
04:41:58 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
04:41:58 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
04:41:58 [INFO] Chunk (-19, 8) stored at  (-6, 5)World.cleanUp(
04:41:58 [SEVERE] java.lang.Throwableraft.server.World.cleanUp(
04:41:58 [SEVERE]       at org.bukkit.craftbukkit.util.LongHashtable.get(LongHashtable.java:32)
04:41:58  [SEVERE]       at net.minecraft.server.World.cleanUp(

it keeps repeating it self except for the chunk numbers change.

never mind fixed it with chunkster, the map was corrupt .

EDIT by Moderator: merged posts, please use the edit button instead of double posting.