---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 17:40 03/12/15
Description: Exception ticking world

java.lang.IllegalArgumentException: Cannot get property arh

{name=half, clazz=class als$a, values=[top, bottom]}

as it does not exist in aqv

{block=minecraft:double_stone_slab, properties=[seamless, variant]}

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(Unknown Source)

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: 1.9 test
All players: 1 total; [lr['pauloalbert'/36, l='1.9 test', x=-426.65, y=57.04, z=1561.12]]
Chunk stats: ServerChunkCache: 593 Drop: 0
Level seed: -6018756727870468606
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: World: (-364,4,1438), Chunk: (at 4,0,14 in -23,89; contains blocks -368,0,1424 to -353,255,1439), Region: (-1,2; contains chunks -32,64 to -1,95, blocks -512,0,1024 to -1,255,1535)
Level time: 3467504 game time, 1 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 143363 (now: false), thunder time: 56910 (now: false)
Level game mode: Game mode: survival (ID 0). 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(Unknown Source)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 223606968 bytes (213 MB) / 434352128 bytes (414 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['pauloalbert'/36, l='1.9 test', x=-426.65, y=57.04, z=1561.12]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.