Unable to create new worlds

[layton452]

For several days now I've been unable to create new single player worlds - the client finishes loading NEI and then crashes. Connecting to a server world however, is completely fine. Can anyone help? It would be much appreciated! Here is the error report:

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 16/02/13 15:15
Description: Exception in server tick loop

java.lang.IllegalAccessError: tried to access field im.g from class codechicken.chunkloader.ChunkLoaderManager
at codechicken.chunkloader.ChunkLoaderManager.cleanChunks(ChunkLoaderManager.java:760)
at codechicken.chunkloader.ChunkLoaderManager.tickEnd(ChunkLoaderManager.java:789)
at codechicken.chunkloader.ChunkLoaderEventHandler.tickEnd(ChunkLoaderEventHandler.java:39)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:138)
at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:282)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:688)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)

I've also tried creating a new world on a fresh Direwolf20 modpack install, with the same result.

 

[Brambo27]

Yes i seem to have the same problem

Error: 2013-02-16 17:49:23 [INFO] [STDERR] java.lang.IllegalAccessError: tried to access field im.g from class codechicken.chunkloader.ChunkLoaderManager
2013-02-16 17:49:23 [INFO] [STDERR] at codechicken.chunkloader.ChunkLoaderManager.cleanChunks(ChunkLoaderManager.java:760)
2013-02-16 17:49:23 [INFO] [STDERR] at codechicken.chunkloader.ChunkLoaderManager.tickEnd(ChunkLoaderManager.java:789)
2013-02-16 17:49:23 [INFO] [STDERR] at codechicken.chunkloader.ChunkLoaderEventHandler.tickEnd(ChunkLoaderEventHandler.java:39)
2013-02-16 17:49:23 [INFO] [STDERR] at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)
2013-02-16 17:49:23 [INFO] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:138)
2013-02-16 17:49:23 [INFO] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:282)
2013-02-16 17:49:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:689)
2013-02-16 17:49:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599)
2013-02-16 17:49:23 [INFO] [STDERR] at bdz.q(IntegratedServer.java:123)
2013-02-16 17:49:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
2013-02-16 17:49:23 [INFO] [STDERR] at fy.run(SourceFile:849)

 

[netwar]

I also have the same problem
Mindcrack pack v8.0.1
again multiplayer is fine

 

[joshdude106]

I have been having the same problem and not being able to create a single player world using the Direwolf20 pack v5.1.0 and v5.1.1 . Minecraft crashes with the exact same error report. But it's still fine with multiplayer. I have no idea what to do and if anyone knows whats going on help would be much appriciated.