/help command seems to generate errors, unsure whats doing it.

[SteamCrunk]

Whenever I try to use the 'help' command, I get an error stating 'An unknown error occurred while attempting to perform this command'.  I have been pruning the mods mentioned in the console when this error pops up, but I'm still getting this error, and now there doesn't seem to be any source that I can discern.

 

Console output

 

2014-01-12 15:45:57 [iNFO] [sTDERR] java.lang.IllegalArgumentException: Comparison method violates its general contract!

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.ComparableTimSort.mergeLo(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.ComparableTimSort.mergeAt(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.ComparableTimSort.mergeCollapse(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.ComparableTimSort.sort(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.ComparableTimSort.sort(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.Arrays.sort(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at java.util.Collections.sort(Unknown Source)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.command.CommandHelp.func_71534_d(SourceFile:74)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.command.CommandHelp.func_71515_b(SourceFile:36)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:88)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.NetServerHandler.func_72566_d(NetServerHandler.java:759)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.NetServerHandler.func_72481_a(NetServerHandler.java:728)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.packet.Packet3Chat.func_73279_a(SourceFile:49)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)

2014-01-12 15:45:57 [iNFO] [sTDERR] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

2014-01-12 15:45:57 [iNFO] [Minecraft-Client] [CHAT] An unknown error occurred while attempting to perform this command

 

 

ForgeModLoader-client0.log dropbox link - https://dl.dropboxusercontent.com/u/19887338/ForgeModLoader-client-0.log

[coolboy4531]

Use another version of Forge.

[LexManos]

This is caused by one of the mods you have installed, messing up the sort function.

Try removing mods and see if you can track it down.

[SteamCrunk]

This is caused by one of the mods you have installed, messing up the sort function.

Try removing mods and see if you can track it down.

I was able to remove the offending mods over time, but the biggest issue I ran into was that it seemed to be inconsistent, like I would load up my world once and it would work, then when I loaded again I got the error. 

 

Is there any reason it would behave like this?

[LexManos]

No clue, modders do weird things.