Server has died... Please help

Whenever I try and run the server I get this:

Code:

2011-02-14 18:38:45 [INFO] Preparing level "world"
2011-02-14 18:38:45 [INFO] Preparing start region
java.io.IOException: Not in GZIP format
        at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
        at java.util.zip.GZIPInputStream.<init>(Unknown Source)
        at java.util.zip.GZIPInputStream.<init>(Unknown Source)
        at net.minecraft.server.CompressedStreamTools.a(SourceFile:8)
        at net.minecraft.server.World.<init>(World.java:97)
        at net.minecraft.server.WorldServer.<init>(WorldServer.java:28)
        at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:115)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:106)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:202)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)
java.lang.NullPointerException
        at net.minecraft.server.World.a(World.java:1370)
        at net.minecraft.server.World.a(World.java:1356)
        at net.minecraft.server.Chunk.c(Chunk.java:160)
        at net.minecraft.server.ChunkProviderServer.d(ChunkProviderServer.java:7
9)
        at net.minecraft.server.ChunkProviderServer.b(ChunkProviderServer.java:1
18)
        at net.minecraft.server.World.c(World.java:284)
        at net.minecraft.server.World.getTypeId(World.java:230)
        at net.minecraft.server.World.isEmpty(World.java:234)
        at net.minecraft.server.World.a(World.java:155)
        at net.minecraft.server.WorldProvider.a(SourceFile:52)
        at net.minecraft.server.World.<init>(World.java:138)
        at net.minecraft.server.WorldServer.<init>(WorldServer.java:28)
        at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:115)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:106)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:202)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)
2011-02-14 18:38:45 [SEVERE] Unexpected exception
java.lang.NullPointerException
        at net.minecraft.server.World.a(World.java:1370)
        at net.minecraft.server.World.a(World.java:1356)
        at net.minecraft.server.Chunk.c(Chunk.java:160)
        at net.minecraft.server.ChunkProviderServer.d(ChunkProviderServer.java:7
9)
        at net.minecraft.server.ChunkProviderServer.b(ChunkProviderServer.java:1
18)
        at net.minecraft.server.World.c(World.java:284)
        at net.minecraft.server.World.getTypeId(World.java:230)
        at net.minecraft.server.World.isEmpty(World.java:234)
        at net.minecraft.server.World.a(World.java:155)
        at net.minecraft.server.WorldProvider.a(SourceFile:52)
        at net.minecraft.server.World.<init>(World.java:138)
        at net.minecraft.server.WorldServer.<init>(WorldServer.java:28)
        at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:115)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:106)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:202)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)

I did a scan using verifyworld.cmd and found 31 errors so I deleted those chunks in the world folder and it made no difference.

Please help.

 

And when you let the world generate anew?