---- Minecraft Crash Report ----
// Shall we play a game?

Time: 12/20/14 11:04 AM
Description: Updating screen events

java.lang.IllegalArgumentException: Cannot set property bet{name=facing, clazz=class ej, values=[down, up, north, south, west, east]} to null on block minecraft:piston, it is not an allowed value
	at bef.a(SourceFile:124)
	at bdp.a(SourceFile:409)
	at biv.<init>(SourceFile:25)
	at biu.a(SourceFile:161)
	at biu.a(SourceFile:176)
	at biu.a(SourceFile:199)
	at bwc.a(SourceFile:56)
	at bwz.a(SourceFile:189)
	at bxf.a(SourceFile:342)
	at bwz.a(SourceFile:176)
	at bxf.k(SourceFile:405)
	at bwz.k(SourceFile:164)
	at bxf.p(SourceFile:382)
	at bst.r(SourceFile:1488)
	at bst.at(SourceFile:884)
	at bst.a(SourceFile:321)
	at net.minecraft.client.main.Main.main(SourceFile:124)


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

-- Head --
Stacktrace:
	at bef.a(SourceFile:124)
	at bdp.a(SourceFile:409)
	at biv.<init>(SourceFile:25)
	at biu.a(SourceFile:161)
	at biu.a(SourceFile:176)
	at biu.a(SourceFile:199)
	at bwc.a(SourceFile:56)
	at bwz.a(SourceFile:189)
	at bxf.a(SourceFile:342)
	at bwz.a(SourceFile:176)
	at bxf.k(SourceFile:405)
	at bwz.k(SourceFile:164)
	at bxf.p(SourceFile:382)

-- Affected screen --
Details:
	Screen name: bwz
Stacktrace:
	at bst.r(SourceFile:1488)
	at bst.at(SourceFile:884)
	at bst.a(SourceFile:321)
	at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
	Minecraft Version: 1.8.2-pre1
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.7.0_65, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 183008744 bytes (174 MB) / 751304704 bytes (716 MB) up to 7542407168 bytes (7193 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8092m
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.8.2-pre1
	LWJGL: 2.9.1
	OpenGL: GeForce GT 640/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	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.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Custom Menu]
	Current Language: English (US)
	Profiler Position: N/A (disabled)