Put the summary of the bug you're having here
The world crashes minecraft when I open it.

What I expected to happen was...:
The world to open as normal

What actually happened was...:
Minecraft crashed when I tried to open it.

Steps to Reproduce:
Open a level in minecraft
---- Minecraft Crash Report ----
// You're mean.

Time: 19/06/14 19:35
Description: Exception ticking world

java.lang.IllegalArgumentException: Cannot set property ayl

to down on block minecraft:chest, it is not an allowed value
at aya.a(SourceFile:131)
at aow.a(SourceFile:425)
at ou.h(SourceFile:342)
at ou.c(SourceFile:179)
at net.minecraft.server.MinecraftServer.w(SourceFile:570)
at net.minecraft.server.MinecraftServer.v(SourceFile:506)
at coe.v(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:422)
at java.lang.Thread.run(Thread.java:744)

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

– Head –
Stacktrace:
at aya.a(SourceFile:131)
at aow.a(SourceFile:425)
at ou.h(SourceFile:342)
at ou.c(SourceFile:179)

– Affected level –
Details:
Level name: e
All players: 1 total; [ox['honeyinthehills'/32199, l='e', x=74.18, y=74.00, z=-37.54]]
Chunk stats: ServerChunkCache: 1112 Drop: 0
Level seed: 780153668
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: 29.00,64.00,-26.00 - World: (29,64,-26), Chunk: (at 13,4,6 in 1,-2; contains blocks 16,0,-32 to 31,255,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 1018240712 game time, 1037719756 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 85260 (now: false), thunder time: 43311 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.w(SourceFile:570)
at net.minecraft.server.MinecraftServer.v(SourceFile:506)
at coe.v(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:422)
at java.lang.Thread.run(Thread.java:744)

– System Details –
Details:
Minecraft Version: 14w25b
Operating System: Linux (amd64) version 3.13.0-29-generic
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 312973936 bytes (298 MB) / 716701696 bytes (683 MB) up to 954728448 bytes (910 MB)
JVM Flags: 1 total; -Xmx1G
IntCache: cache: 1, tcache: 0, allocated: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [ox['honeyinthehills'/32199, l='e', x=74.18, y=74.00, z=-37.54]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.