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Okay, so my saved survival mode won't let me on. I get on and all it says is "Building Terrain" and then it takes me to the main menu. Then I try again and it either crashes or sets up the world but where all of the monsters are frozen, i can't gather materials, I can't take damage, and the unloaded parts of the world are just oblivion. When it does crash, I get this:

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 2/9/13 6:33 PM
Description: Ticking entity

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:436)
at iq.j_(SourceFile:161)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)


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

-- Head --
Stacktrace:
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:436)
at iq.j_(SourceFile:161)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)

-- Entity being ticked --
Details:
Entity Type: null (iq)
Entity ID: 31355
Name: TheBranders
Exact location: -607.76, 19.00, 62.94
Block location: World: (-608,19,62), Chunk: (at 0,1,14 in -38,3; contains blocks -608,0,48 to -593,255,63), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Momentum: 0.00, -0.08, 0.00
Stacktrace:
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)

-- Affected level --
Details:
Level name: The New World
All players: 1 total; [iq['TheBranders'/31355, l='The New World', x=-607.76, y=19.00, z=62.94]]
Chunk stats: ServerChunkCache: 646 Drop: 0
Level seed: -730841321634916917
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-586,64,6), Chunk: (at 6,4,6 in -37,0; contains blocks -592,0,0 to -577,255,15), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Level time: 1026516 game time, 1200484 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 58934 (now: false), thunder time: 130386 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_26, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 404470248 bytes (385 MB) / 554369024 bytes (528 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 135688 (7598528 bytes; 7 MB) allocated, 135688 (7598528 bytes; 7 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 19404 (1086624 bytes; 1 MB) allocated, 19404 (1086624 bytes; 1 MB) used
Player Count: 1 / 8; [iq['TheBranders'/31355, l='The New World', x=-607.76, y=19.00, z=62.94]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.