game crashed when opening

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

Time: 12/3/15 5:49 AM
Description: Exception while updating neighbours

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 aox.b(SourceFile:77)
at aox.a(SourceFile:99)
at aox.f(SourceFile:154)
at aox.e(SourceFile:128)
at anr.a(SourceFile:149)
at ahn.e(SourceFile:444)
at ahn.d(SourceFile:411)
at anr.c(SourceFile:78)
at arw.a(SourceFile:483)
at ahn.a(SourceFile:309)
at anr.b(SourceFile:141)
at lp.a(SourceFile:646)
at lp.d(SourceFile:215)
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 aox.b(SourceFile:77)
at aox.a(SourceFile:99)
at aox.f(SourceFile:154)
at aox.e(SourceFile:128)
at anr.a(SourceFile:149)

– Block being updated –
Details:
Source block type: ID #76 (tile.notGate // anr)
Block: minecraft:redstone_torch[facing=up]
Block location: World: (-352,65,303), Chunk: (at 0,4,15 in -22,18; contains blocks -352,0,288 to -337,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
at ahn.e(SourceFile:444)
at ahn.d(SourceFile:411)
at anr.c(SourceFile:78)
at arw.a(SourceFile:483)
at ahn.a(SourceFile:309)
at anr.b(SourceFile:141)

– Block being ticked –
Details:
Block: minecraft:unlit_redstone_torch[facing=up]
Block location: World: (-352,63,303), Chunk: (at 0,3,15 in -22,18; contains blocks -352,0,288 to -337,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
at lp.a(SourceFile:646)
at lp.d(SourceFile:215)

– Affected level –
Details:
Level name: the world of winter
All players: 1 total; [lr['huy'/68, l='the world of winter', x=-256.74, y=71.50, z=409.73]]
Chunk stats: ServerChunkCache: 926 Drop: 0
Level seed: -6744081726269180804
Level generator: ID 04 - customized, ver 0. Features enabled: true
Level generator options: {"coordinateScale":684.412,"heightScale":684.412,"lowerLimitScale":512.0,"upperLimitScale":512.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":0.0,"seaLevel":63,"useCaves":false,"useDungeons":false,"dungeonChance":1,"useStrongholds":false,"useVillages":true,"useMineShafts":false,"useTemples":true,"useMonuments":false,"useRavines":false,"useWaterLakes":false,"waterLakeChance":100,"useLavaLakes":false,"lavaLakeChance":100,"useLavaOceans":false,"fixedBiome":10,"biomeSize":8,"riverSize":4,"dirtSize":33,"dirtCount":10,"dirtMinHeight":0,"dirtMaxHeight":256,"gravelSize":33,"gravelCount":8,"gravelMinHeight":0,"gravelMaxHeight":256,"graniteSize":33,"graniteCount":10,"graniteMinHeight":0,"graniteMaxHeight":80,"dioriteSize":33,"dioriteCount":10,"dioriteMinHeight":0,"dioriteMaxHeight":80,"andesiteSize":33,"andesiteCount":10,"andesiteMinHeight":0,"andesiteMaxHeight":80,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":128,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":64,"goldSize":49,"goldCount":40,"goldMinHeight":0,"goldMaxHeight":0,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":16,"diamondSize":8,"diamondCount":1,"diamondMinHeight":0,"diamondMaxHeight":16,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":16,"lapisSpread":16}
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2517494 game time, 6498 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (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(Unknown Source)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows XP (x86) version 5.1
Java Version: 1.8.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 39161672 bytes (37 MB) / 227000320 bytes (216 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 103
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lr['huy'/68, l='the world of winter', x=-256.74, y=71.50, z=409.73]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.