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I'm sorry if I should have put this under the Modification Development section, but since this is the modded Client Support section, I thought I should put this here. Anyway, my game freeze on the "Loading Terrain Building Terrain" screen. In Eclipse's console, this is the error I get whenever I try to open up the world.


27 achievements
210 recipes
Setting user: Player472, -
Client asked for parameter: server
LWJGL Version: 2.4.2
ModLoader 1.4.7 Initializing...
Mod Initialized: mod_silvvy 1.4.7
Mod Loaded: mod_silvvy 1.4.7
Done.

Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.

Feb 05, 2013 1:07:10 AM net.minecraft.src.IntegratedServer startServer
INFO: Starting integrated minecraft server version 1.4.7
Feb 05, 2013 1:07:10 AM net.minecraft.src.IntegratedServer startServer
INFO: Generating keypair
Feb 05, 2013 1:07:10 AM net.minecraft.server.MinecraftServer initialWorldChunkLoad
INFO: Preparing start region for level 0
Feb 05, 2013 1:07:11 AM net.minecraft.server.MinecraftServer outputPercentRemaining
INFO: Preparing spawn area: 31%
java.lang.IllegalArgumentException
at net.minecraft.src.WeightedRandom.getRandomItem(WeightedRandom.java:32)
at net.minecraft.src.WeightedRandom.getRandomItem(WeightedRandom.java:61)
at net.minecraft.src.SpawnerAnimals.performWorldGenSpawning(SpawnerAnimals.java:233)
at net.minecraft.src.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:523)
at net.minecraft.src.ChunkProviderServer.populate(ChunkProviderServer.java:233)
at net.minecraft.src.Chunk.populateChunk(Chunk.java:1132)
at net.minecraft.src.ChunkProviderServer.loadChunk(ChunkProviderServer.java:128)
at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:324)
at net.minecraft.src.IntegratedServer.loadAllWorlds(IntegratedServer.java:86)
at net.minecraft.src.IntegratedServer.startServer(IntegratedServer.java:102)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:465)
at net.minecraft.src.ThreadMinecraftServer.run(ThreadMinecraftServer.java:18)
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer run
SEVERE: Encountered an unexpected exception IllegalArgumentException
java.lang.IllegalArgumentException
at net.minecraft.src.WeightedRandom.getRandomItem(WeightedRandom.java:32)
at net.minecraft.src.WeightedRandom.getRandomItem(WeightedRandom.java:61)
at net.minecraft.src.SpawnerAnimals.performWorldGenSpawning(SpawnerAnimals.java:233)
at net.minecraft.src.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:523)
at net.minecraft.src.ChunkProviderServer.populate(ChunkProviderServer.java:233)
at net.minecraft.src.Chunk.populateChunk(Chunk.java:1132)
at net.minecraft.src.ChunkProviderServer.loadChunk(ChunkProviderServer.java:128)
at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:324)
at net.minecraft.src.IntegratedServer.loadAllWorlds(IntegratedServer.java:86)
at net.minecraft.src.IntegratedServer.startServer(IntegratedServer.java:102)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:465)
at net.minecraft.src.ThreadMinecraftServer.run(ThreadMinecraftServer.java:18)

Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer run
SEVERE: This crash report has been saved to: C:\Users\conner\Desktop\modding\jars\.\crash-reports\crash-2013-02-05_01.07.12-server.txt
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer stopServer
INFO: Stopping server
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer stopServer
INFO: Saving players
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer stopServer
INFO: Saving worlds
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer saveAllWorlds
INFO: Saving chunks for level 'New World'/Overworld
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer saveAllWorlds
INFO: Saving chunks for level 'New World'/Nether
Feb 05, 2013 1:07:12 AM net.minecraft.server.MinecraftServer saveAllWorlds
INFO: Saving chunks for level 'New World'/The End
Someone is closing me!
Feb 05, 2013 1:07:19 AM net.minecraft.server.MinecraftServer stopServer
INFO: Stopping server
Feb 05, 2013 1:07:19 AM net.minecraft.server.MinecraftServer stopServer
INFO: Saving players