Problem Problem with OP

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Xionous

New Member
Jul 29, 2019
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On my server if i make myself OP when i type certain commands like /help i get this error message:

Code: 
8:07:56 PM CONSOLE: [INFO] java.lang.IllegalArgumentException: Comparison method violates its general contract!
8:07:56 PM CONSOLE: [INFO] at java.util.ComparableTimSort.mergeHi(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.ComparableTimSort.mergeAt(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.ComparableTimSort.mergeForceCollapse(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.ComparableTimSort.sort(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.ComparableTimSort.sort(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.Arrays.sort(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at java.util.Collections.sort(Unknown Source)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.command.CommandHelp.func_71534_d(SourceFile:74)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.command.CommandHelp.func_71515_b(SourceFile:36)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:88)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.NetServerHandler.func_72566_d(NetServerHandler.java:759)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.NetServerHandler.func_72481_a(NetServerHandler.java:728)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.packet.Packet3Chat.func_73279_a(SourceFile:49)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
8:07:56 PM CONSOLE: [INFO] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

and the command fails to execute.

some basic information:

Mod pack: Direwolf20 1.6.4 ( + mekinism )
Server wrapper: MCMyAdmin
Additional Things: Mytown ( forge perms with Pex )
 
not using plugins, the only changes made to the original pack are listed on the bottom of the post
 
I'm encountering the same exact problem, console printout is word for word the same. After I opped myself every single command attempt through the client results in that. Using the Direwolf20 1.6.4 server downloaded straight from the ftb launcher with absolutely nothing added or removed. I didn't find anything about this with a quick search in the modpack bugs report thread, should I do some additional tests and then cross post this there?
 
I had this issue and was able to resolve it. I think my fix was to disable in-game whitelisting.

My setup that now works:
* Use McMA's whitelisting as normal (add people to users and groups, enable whitelisting under configuration -> features)
* Manually add admins into the stock ops.txt file
* server.properties: white-list=false

Please post back if this works for you.
 
I get the same error when typing /help:
Windows 7/Java 7 Update 45 (64bit)

2014-01-22 23:45:00 [INFO] [STDERR] java.lang.IllegalArgumentException: Comparison method violates its general contract!
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.ComparableTimSort.mergeHi(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.ComparableTimSort.mergeAt(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.ComparableTimSort.mergeForceCollapse(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.ComparableTimSort.sort(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.ComparableTimSort.sort(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.Arrays.sort(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at java.util.Collections.sort(Unknown Source)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.command.CommandHelp.func_71534_d(SourceFile:74)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.command.CommandHelp.func_71515_b(SourceFile:36)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:88)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.NetServerHandler.func_72566_d(NetServerHandler.java:759)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.NetServerHandler.func_72481_a(NetServerHandler.java:728)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.packet.Packet3Chat.func_73279_a(SourceFile:49)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
2014-01-22 23:45:00 [INFO] [STDERR] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
 
I'm havin' exactly the same issue with my FTB-Infinity Server. Don't have anything added or removed either.

[00:47:03] [Server thread/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_31]
at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:479) ~[?:1.8.0_31]
at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:402) ~[?:1.8.0_31]
at java.util.ComparableTimSort.sort(ComparableTimSort.java:209) ~[?:1.8.0_31]
at java.util.Arrays.sort(Arrays.java:1312) ~[?:1.8.0_31]
at java.util.Arrays.sort(Arrays.java:1506) ~[?:1.8.0_31]
at java.util.ArrayList.sort(ArrayList.java:1454) ~[?:1.8.0_31]
at java.util.Collections.sort(Collections.java:141) ~[?:1.8.0_31]
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.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:370) [lt.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:335) [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:?]
 
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