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My minecraft keeps crashing once I convert a world to the format Anvil. Everything other works, exept converting a world (all worlds I try to convert crashes). I am running vanilla 1.6.2. Here is the crash report I get:

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 07.09.13 15:46
Description: Reading NBT data

java.lang.ClassCastException: ce cannot be cast to cg
at bx.f(SourceFile:138)
at ady.a(SourceFile:30)
at alk.a(SourceFile:215)
at alk.a(SourceFile:186)
at alk.a(SourceFile:145)
at net.minecraft.server.MinecraftServer.a(SourceFile:113)
at bkw.a(SourceFile:61)
at bkw.d(SourceFile:106)
at net.minecraft.server.MinecraftServer.run(SourceFile:314)
at hh.run(SourceFile:582)


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 bx.f(SourceFile:138)
at ady.a(SourceFile:30)
at alk.a(SourceFile:215)
at alk.a(SourceFile:186)
at alk.a(SourceFile:145)
at net.minecraft.server.MinecraftServer.a(SourceFile:113)
at bkw.a(SourceFile:61)
at bkw.d(SourceFile:106)
at net.minecraft.server.MinecraftServer.run(SourceFile:314)
at hh.run(SourceFile:582)

-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 29275024 bytes (27 MB) / 79024128 bytes (75 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
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: 0, tallocated: 0
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.

I have newest version of Java and everything, please help? I am running Windows 8, with 8GB ram.

Quote from jacobkolstad

...

Hi,

This is because there are invalid NBT entries in the world.

Are you sure you have never used any map editing tools / mods on that world?

Quote from Extreme_Heat

Hi,

This is because there are invalid NBT entries in the world.

Are you sure you have never used any map editing tools / mods on that world?

I don't know anything about the world. My job is just to make it useable with 1.6+ (fixing redstone, bugs like iron doors etc.)

But is it a way to fix it?

Anyone?