---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 18.01.13 21:38
Description: Reading NBT data

java.lang.ClassCastException: bx cannot be cast to bz
	at bq.f(SourceFile:134)
	at aaz.a(SourceFile:30)
	at ail.a(SourceFile:210)
	at ail.a(SourceFile:181)
	at ail.a(SourceFile:140)
	at net.minecraft.server.MinecraftServer.b(SourceFile:110)
	at bhc.a(SourceFile:54)
	at bhc.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:304)
	at gi.run(SourceFile:565)


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 aaz.a(SourceFile:30)
	at ail.a(SourceFile:210)
	at ail.a(SourceFile:181)
	at ail.a(SourceFile:140)
	at net.minecraft.server.MinecraftServer.b(SourceFile:110)
	at bhc.a(SourceFile:54)
	at bhc.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:304)
	at gi.run(SourceFile:565)

-- System Details --
Details:
	Minecraft Version: 13w03a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 379717600 bytes (362 MB) / 542572544 bytes (517 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xmx1g -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.