FTB-Error

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 12/26/12 5:21 PM
Description: loading nbt data

java.io.EOFException: Unexpected end of ZLIB input stream
	at java.util.zip.InflaterInputStream.fill(Unknown Source)
	at java.util.zip.InflaterInputStream.read(Unknown Source)
	at java.util.zip.GZIPInputStream.read(Unknown Source)
	at java.io.BufferedInputStream.fill(Unknown Source)
	at java.io.BufferedInputStream.read1(Unknown Source)
	at java.io.BufferedInputStream.read(Unknown Source)
	at java.io.DataInputStream.readFully(Unknown Source)
	at java.io.DataInputStream.readUTF(Unknown Source)
	at java.io.DataInputStream.readUTF(Unknown Source)
	at bu.b(SourceFile:90)
	at bh.a(SourceFile:33)
	at bu.b(SourceFile:95)
	at br.a(CompressedStreamTools.java:126)
	at br.a(CompressedStreamTools.java:33)
	at portalgun.common.PortalGun.loadList(PortalGun.java:637)
	at portalgun.common.core.EventHandler.onWorldLoad(EventHandler.java:90)
	at net.minecraftforge.event.ASMEventHandler_98_EventHandler_onWorldLoad_Load.invoke(.dynamic)
	at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
	at net.minecraftforge.event.EventBus.post(EventBus.java:103)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:278)
	at hg.c(DedicatedServer.java:153)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:454)
	at fp.run(SourceFile:818)

Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Linux (amd64) version 2.6.32-41-generic
- Java Version: 1.6.0_31, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 133564160 bytes (127 MB) / 231079936 bytes (220 MB) up to 1908932608 bytes (1820 MB)
- JVM Flags: 2 total; -Xmx2048M -Xms192M
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- FML: ~ERROR~ NullPointerException: null
- Tag name:
- Tag type: 10
- Is Modded: Definitely; 'forge,fml'
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- Player Count: 0 / 15; []
- World world Entities: 0 total; []
- World world Players: 0 total; []
- World world Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Dedicated Server