Game Crash! /particle

My game crash wen I do the /particle mobappearance ~ ~ ~ 0 0 0 1.

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Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at cfq.a(SourceFile:74)
at cfv.b(SourceFile:321)
at cif.a(SourceFile:1250)
at cif.a(SourceFile:1117)
at cif.b(SourceFile:970)
at brw.as(SourceFile:897)
at brw.a(SourceFile:308)
at net.minecraft.client.main.Main.main(SourceFile:120)
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Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
__________________________________________________________
– System Details –
Details:
Minecraft Version: 14w31a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 155613752 bytes (148 MB) / 322498560 bytes (307 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
Launched Version: 14w31a
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3379, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.