---- Minecraft Crash Report ----
// Why did you do that?

Time: 02/01/13 09:55
Description: Reading NBT data

java.lang.ClassCastException: bx cannot be cast to bz
	at bq.f(SourceFile:134)
	at aah.a(SourceFile:30)
	at ahs.a(SourceFile:210)
	at ahs.a(SourceFile:181)
	at ahs.a(SourceFile:140)
	at net.minecraft.server.MinecraftServer.b(SourceFile:394)
	at bdz.a(SourceFile:54)
	at bdz.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:588)
	at fy.run(SourceFile:849)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Corrupt NBT tag --
Details:
	Tag type found: INT
	Tag type expected: LONG
	Tag name: LastUpdate
	Tag parent: Level
Stacktrace:
	at bq.f(SourceFile:134)
	at aah.a(SourceFile:30)
	at ahs.a(SourceFile:210)
	at ahs.a(SourceFile:181)
	at ahs.a(SourceFile:140)
	at net.minecraft.server.MinecraftServer.b(SourceFile:394)
	at bdz.a(SourceFile:54)
	at bdz.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:588)
	at fy.run(SourceFile:849)

-- System Details --
Details:
	Minecraft Version: 1.4.6
	Operating System: Linux (amd64) version 3.5.0-21-generic
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 462093744 bytes (440 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xmx1024M -Xms512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.