---- Minecraft Crash Report ----
// Don't do that.

Time: 15-03-03 13:09
Description: Reading NBT data

java.lang.ClassCastException: ck cannot be cast to cj
	at by.d(SourceFile:120)
	at ye.c(SourceFile:128)
	at ye.a(SourceFile:75)
	at ud.b(SourceFile:360)
	at uf.a(SourceFile:579)
	at jv.a(SourceFile:82)
	at nn.f(SourceFile:1062)
	at hn.a(SourceFile:155)
	at hn.a(SourceFile:54)
	at blc.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:489)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)


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

-- Corrupt NBT tag --
Details:
	Tag type found: STRING
	Tag type expected: SHORT
	Tag name: id
Stacktrace:
	at by.d(SourceFile:120)
	at ye.c(SourceFile:128)
	at ye.a(SourceFile:75)
	at ud.b(SourceFile:360)
	at uf.a(SourceFile:579)
	at jv.a(SourceFile:82)

-- Entity being loaded --
Details:
	Entity Type: null (jv)
	Entity ID: 315
	Entity Name: Ianman
	Entity's Exact location: -166,63, 78,00, 112,76
	Entity's Block location: World: (-167,78,112), Chunk: (at 9,4,0 in -11,7; contains blocks -176,0,112 to -161,255,127), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0,00, -0,08, 0,00
Stacktrace:
	at nn.f(SourceFile:1062)
	at hn.a(SourceFile:155)
	at hn.a(SourceFile:54)
	at blc.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:489)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 57075608 bytes (54 MB) / 224026624 bytes (213 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	AABB Pool Size: 2565 (143640 bytes; 0 MB) allocated, 2565 (143640 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 479 (26824 bytes; 0 MB) allocated, 479 (26824 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.