[Error] Couldn't process command: 'help'java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:862) ~[?:1.8.0_05] at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:479) ~[?:1.8.0_05] at java.util.ComparableTimSort.mergeForceCollapse(ComparableTimSort.java:418) ~[?:1.8.0_05] at java.util.ComparableTimSort.sort(ComparableTimSort.java:218) ~[?:1.8.0_05] at java.util.Arrays.sort(Arrays.java:1244) ~[?:1.8.0_05] at java.util.Collections.sort(Collections.java:166) ~[?:1.8.0_05] at net.minecraft.command.CommandHelp.func_71534_d(SourceFile:84) ~[au.class:?] at net.minecraft.command.CommandHelp.func_71515_b(SourceFile:38) ~[au.class:?] at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:94) [z.class:?] at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:739) [nh.class:?] at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:718) [nh.class:?] at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:37) [ir.class:?] at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9) [ir.class:?] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) [ej.class:?] at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) [lt.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]