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after i installed the pixelmon mod i started to get this error when i start a new world


---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 9/8/12 9:42 PM
Description: Exception in server tick loop

java.lang.NullPointerException
at Reflector.callInt(Reflector.java:214)
at jw.d(EntityLiving.java:1030)
at jw.a(EntityLiving.java:882)
at nu.a(SourceFile:43)
at jn.e(Entity.java:996)
at jn.d(Entity.java:856)
at jw.e(EntityLiving.java:1369)
at jw.d(EntityLiving.java:1601)
at nu.d(SourceFile:25)
at nx.d(SourceFile:81)
at jw.h_(EntityLiving.java:688)
at nu.h_(SourceFile:30)
at up.a(World.java:2022)
at gr.a(WorldServer.java:538)
at up.g(World.java:1986)
at up.h(World.java:1867)
at gr.h(WorldServer.java:437)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:616)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:547)
at axv.p(IntegratedServer.java:102)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:453)
at ep.run(SourceFile:539)

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_05, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 768488344 bytes (732 MB) / 1029046272 bytes (981 MB) up to 1908932608 bytes (1820 MB)
- JVM Flags: 2 total; -Xmx2048m -Xms1024m
- Is Modded: Definitely; 'forge,fml'
- Profiler Position: N/A (disabled)
- Player Count: 1 / 8; [gu['Draconis234'/149, l='New World', x=265.50, y=69.03, z=240.50]]
- World New World Entities: 0 total; []
- World New World Players: 0 total; []
- World New World Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Integrated Server

SOMEBODY HELP ME