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

Time: 12/2/15 7:39 PM
Description: Exception ticking world

java.lang.IllegalArgumentException: Cannot get property arh

as it does not exist in aqv

at aqv$a.c(SourceFile:165)
at als.k(SourceFile:50)
at aqv$a.q(SourceFile:388)
at ahu.a(SourceFile:203)
at ahu.a(SourceFile:132)
at lp.d(SourceFile:198)
at net.minecraft.server.MinecraftServer.D(SourceFile:617)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at bxz.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Thread.java:745)

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

– Head –
Stacktrace:
at aqv$a.c(SourceFile:165)
at als.k(SourceFile:50)
at aqv$a.q(SourceFile:388)
at ahu.a(SourceFile:203)
at ahu.a(SourceFile:132)
at lp.d(SourceFile:198)

– Affected level –
Details:
Level name: lit
All players: 1 total; [lr['BIG_CLARKY'/9, l='lit', x=-248.86, y=5.37, z=-821.73]]
Chunk stats: ServerChunkCache: 441 Drop: 0
Level seed: -4565603078613352595
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (-253,4,-810), Chunk: (at 3,0,6 in -16,-51; contains blocks -256,0,-816 to -241,255,-801), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
Level time: 924 game time, 924 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 87846 (now: false), thunder time: 115066 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:617)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at bxz.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 15w49a
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: 97847520 bytes (93 MB) / 248045568 bytes (236 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
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lr['BIG_CLARKY'/9, l='lit', x=-248.86, y=5.37, z=-821.73]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.