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My world in minecraft has crashed recently, and I am wondering if any of you have had this crash and if you might know how to fix it:


Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception in server tick loop
This error has been saved to C:\Users\Devon\AppData\Roaming\.minecraft\crash-reports\crash-2012-10-31_16.10.25-server.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 20914aec --------
Generated 10/31/12 4:10 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_07, Oracle Corporation
- Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 351752160 bytes (335 MB) / 896794624 bytes (855 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 136692 (7654752 bytes; 7 MB) allocated, 136692 (7654752 bytes; 7 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 5807 (325192 bytes; 0 MB) allocated, 5807 (325192 bytes; 0 MB) used
- Player Count: 0 / 8; []
- World Home World Entities: 0 total; []
- World Home World Players: 0 total; []
- World Home World Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Integrated Server

java.lang.NullPointerException
at bw.b(SourceFile:103)
at bw.a(SourceFile:35)
at im.b(SourceFile:457)
at ge.a(SourceFile:73)
at bce.b(SourceFile:72)
at net.minecraft.server.MinecraftServer.r(SourceFile:731)
at net.minecraft.server.MinecraftServer.q(SourceFile:661)
at bcb.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:595)
at fp.run(SourceFile:818)
--- END ERROR REPORT 9f59c51b ----------