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I was playing a world and had advanced quite far. I started building a huge platform and the game started crashing only when I opened this world.

I am running Minecraft 1.7.10 with snapshots allowed on a 2014 iMac running OS X 10.9.4 and Java Version 7 update 60. The bug report is below:

Same error in my new world based on the same seed. I still have copies of both worlds there, but they just don't seem to work. The new world crashed with a similar error. The bug report is below.

---- Minecraft Crash Report ----
// There are four lights!

Time: 7/9/14 7:14 PM
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot get property bcj{name=variant, clazz=class azb, values=[stone, sandstone, wood_old, cobblestone, brick, stone_brick, nether_brick, quartz]} as it does not exist!
at bbw.b(SourceFile:91)
at ami.a(SourceFile:86)
at cdt.a(SourceFile:295)
at bqi.ar(SourceFile:1325)
at bqi.q(SourceFile:1682)
at bqi.ap(SourceFile:863)
at bqi.a(SourceFile:303)
at net.minecraft.client.main.Main.main(SourceFile:120)


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

-- Head --
Stacktrace:
at bbw.b(SourceFile:91)
at ami.a(SourceFile:86)
at cdt.a(SourceFile:295)
at bqi.ar(SourceFile:1325)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [chv['Cherberube'/321, l='MpServer', x=-126.88, y=65.00, z=148.06]]
Chunk stats: MultiplayerChunkCache: 1083, 1083
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: -88.00,64.00,188.00 - World: (-88,64,188), Chunk: (at 8,4,12 in -6,11; contains blocks -96,0,176 to -81,255,191), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 13397 game time, 13397 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 76 total; [adr['Creeper'/266338, l='MpServer', x=-90.50, y=17.00, z=169.50], abb['Bat'/258800, l='MpServer', x=-138.53, y=15.00, z=221.88], aff['Spider'/234037, l='MpServer', x=-156.31, y=50.09, z=170.69], aex['Skeleton'/228194, l='MpServer', x=-202.50, y=44.00, z=70.50], afk['Zombie'/229891, l='MpServer', x=-132.97, y=32.00, z=70.53], adr['Creeper'/223833, l='MpServer', x=-146.50, y=31.00, z=68.50], aex['Skeleton'/228191, l='MpServer', x=-198.94, y=42.00, z=73.56], afk['Zombie'/232108, l='MpServer', x=-136.50, y=22.00, z=130.50], afk['Zombie'/261435, l='MpServer', x=-196.50, y=64.00, z=156.50], abb['Bat'/221936, l='MpServer', x=-172.68, y=35.16, z=72.78], adt['Enderman'/237272, l='MpServer', x=-136.50, y=21.00, z=222.50], abb['Bat'/261659, l='MpServer', x=-143.94, y=35.14, z=72.68], abb['Bat'/163863, l='MpServer', x=-119.56, y=40.10, z=98.44], adr['Creeper'/261189, l='MpServer', x=-70.50, y=50.00, z=115.50], afk['Zombie'/261193, l='MpServer', x=-70.50, y=50.00, z=114.50], afk['Zombie'/261194, l='MpServer', x=-72.50, y=50.00, z=115.50], abn['Pig'/93, l='MpServer', x=-174.16, y=74.00, z=180.47], abn['Pig'/102, l='MpServer', x=-186.13, y=75.00, z=164.06], abn['Pig'/103, l='MpServer', x=-172.91, y=73.00, z=178.94], afk['Zombie'/246210, l='MpServer', x=-153.50, y=40.00, z=78.50], abn['Pig'/101, l='MpServer', x=-158.50, y=71.00, z=181.81], adr['Creeper'/217818, l='MpServer', x=-97.50, y=48.00, z=208.50], acy['item.tile.sapling.birch'/265460, l='MpServer', x=-189.22, y=77.00, z=171.03], afk['Zombie'/267604, l='MpServer', x=-112.50, y=67.02, z=99.50], abn['Pig'/127, l='MpServer', x=-148.38, y=65.00, z=104.50], afk['Zombie'/265726, l='MpServer', x=-92.19, y=23.00, z=121.44], afk['Zombie'/265727, l='MpServer', x=-95.50, y=24.00, z=126.50], abn['Pig'/129, l='MpServer', x=-149.56, y=65.00, z=104.50], abn['Pig'/128, l='MpServer', x=-138.06, y=63.00, z=105.63], adt['Enderman'/227523, l='MpServer', x=-200.50, y=44.00, z=85.50], abo['Rabbit'/131, l='MpServer', x=-144.03, y=68.00, z=98.50], abn['Pig'/130, l='MpServer', x=-148.72, y=65.00, z=106.72], abb['Bat'/133, l='MpServer', x=-138.41, y=41.10, z=143.03], afk['Zombie'/242402, l='MpServer', x=-162.50, y=39.02, z=74.50], afk['Zombie'/261095, l='MpServer', x=-201.50, y=65.00, z=184.50], abe['Chicken'/154, l='MpServer', x=-124.66, y=66.00, z=220.47], abe['Chicken'/155, l='MpServer', x=-134.66, y=66.00, z=223.34], abe['Chicken'/156, l='MpServer', x=-139.38, y=67.00, z=221.31], aex['Skeleton'/266971, l='MpServer', x=-147.50, y=16.00, z=203.50], abe['Chicken'/158, l='MpServer', x=-143.38, y=67.00, z=216.66], abb['Bat'/263325, l='MpServer', x=-82.23, y=46.63, z=98.56], abo['Rabbit'/146, l='MpServer', x=-132.47, y=64.00, z=98.47], abb['Bat'/263327, l='MpServer', x=-84.58, y=45.21, z=99.30], abo['Rabbit'/147, l='MpServer', x=-133.47, y=69.00, z=97.50], afk['Zombie'/261096, l='MpServer', x=-201.50, y=65.00, z=186.50], afk['Zombie'/261098, l='MpServer', x=-203.50, y=65.00, z=184.50], afk['Zombie'/245005, l='MpServer', x=-198.50, y=41.00, z=89.50], aex['Skeleton'/256192, l='MpServer', x=-198.50, y=40.00, z=84.50], aex['Skeleton'/256193, l='MpServer', x=-196.50, y=40.00, z=88.50], afk['Zombie'/265028, l='MpServer', x=-194.50, y=29.00, z=82.50], abw['Sheep'/175, l='MpServer', x=-98.38, y=67.00, z=70.34], adr['Creeper'/265026, l='MpServer', x=-192.50, y=29.00, z=81.50], aex['Skeleton'/246021, l='MpServer', x=-135.50, y=32.00, z=72.50], adr['Creeper'/260577, l='MpServer', x=-99.50, y=16.00, z=165.50], adr['Creeper'/236296, l='MpServer', x=-142.50, y=52.00, z=199.50], afk['Zombie'/249281, l='MpServer', x=-95.31, y=12.08, z=158.28], abw['Sheep'/176, l='MpServer', x=-96.34, y=69.00, z=72.41], abb['Bat'/263108, l='MpServer', x=-49.71, y=39.05, z=177.76], aex['Skeleton'/265048, l='MpServer', x=-47.50, y=52.00, z=112.50], abb['Bat'/230328, l='MpServer', x=-176.81, y=48.10, z=72.34], adr['Creeper'/239661, l='MpServer', x=-100.50, y=28.00, z=120.50], adt['Enderman'/249272, l='MpServer', x=-100.31, y=16.00, z=163.47], afk['Zombie'/256191, l='MpServer', x=-206.19, y=41.00, z=79.75], aex['Skeleton'/214053, l='MpServer', x=-178.69, y=54.00, z=151.50], afk['Zombie'/256190, l='MpServer', x=-197.50, y=40.00, z=92.50], afk['Zombie'/246613, l='MpServer', x=-133.41, y=21.00, z=127.97], aex['Skeleton'/214052, l='MpServer', x=-176.94, y=54.00, z=152.25], afk['Zombie'/143191, l='MpServer', x=-152.91, y=40.00, z=152.28], adr['Creeper'/214044, l='MpServer', x=-172.97, y=56.00, z=144.59], aez['Slime'/249237, l='MpServer', x=-77.28, y=55.02, z=105.22], chv['Cherberube'/321, l='MpServer', x=-126.88, y=65.00, z=148.06], acy['item.item.rottenFlesh'/147271, l='MpServer', x=-174.13, y=65.00, z=138.16], abb['Bat'/248015, l='MpServer', x=-183.16, y=39.53, z=82.38], abb['Bat'/249770, l='MpServer', x=-158.44, y=41.00, z=150.09], aex['Skeleton'/265806, l='MpServer', x=-202.50, y=69.00, z=103.50], aex['Skeleton'/235146, l='MpServer', x=-178.09, y=41.00, z=175.41]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at cdu.a(SourceFile:308)
at bqi.b(SourceFile:2139)
at bqi.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
Minecraft Version: 14w28a
Operating System: Mac OS X (x86_64) version 10.9.4
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 73952848 bytes (70 MB) / 542081024 bytes (516 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 1 total; -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 14w28a
LWJGL: 2.9.1
OpenGL: NVIDIA GeForce GT 750M OpenGL Engine GL version 2.1 NVIDIA-8.26.26 310.40.45f01, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.

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)

Please help?

So you went from 1.7.10 to snapshots to back again?

If so, your game can't run on 1.7.10 anymore.

Block IDs were changed from Numeric Strings to Alphanumeric strings in snapshots.

Snapshots can handle Numeric String IDs, but 1.7.10 doesn't know what the heck an alphanumeric string is, thus crashing your game.

You MUST play in Snapshots on that world from now on if you want to play in it.

He said he has snapshots enabled but he has 1.7.10 selected so i think he was only using 1.7.10

I'm not sure how the snapshot and version numbers work. I assumed I was using 1.7.10, but I am using snapshots, so does that mean its in 1.8 really? Anyhow, It seems to be working now. Thanks for your guys help!