Bukkit Server crashes after a spam: [Server] INFO Unknown command. Type "help" for help.

This is my first post and hopefully in the right section

I've got a Bukkit server which is ran on Multicraft. And i'm creating and setting up plugins for my server right now. No one is no except me building and doing configs.

The server is running on 1gb of ram and 10 spaces (But it will be 30 spaces when done).
<font color="#ff00ff">SERVERLOG DOWNLOAD: <Edit by Moderator: Redacted mediafire url>
<font color="#ff0000">My problem is after a period of time my server console fills up with: [Server] INFO Unknown command. Type "help" for help. And then crashes the server instantly and there is no way to see what caused it.</font>

My plugins are:
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Timtheenchanter
Worldedit
CustomServerMessages
Simpleautoannouncer
Vault
PlotMe
PEX
Multiverse Core
Multiverse Portals
Commandwatcher
uSkyblock
Worldguard
Signcolours
Modreq
SIgnedit
Chatclear
Parkour
iconomy
Paidranks
Jumpblocks
AdminPrivatechat
Openinv
Chestshop
Clearlag
ProtocolLib
Votifier
Votenow
Autosaveworld
WGCustomFlags
Mob-arena
Essentials
Simplevotelistener
WGFlyflag
Serversigns
EssentialsSpawn
TagAPI
Deathcontol
DisguiseCraft
Timeismoney
EssentialsChat
Battlearena
Infected
Arenaspleef


If you respond thank you

 

Sounds like a piece of software or script on your server (the actual server, not the Minecraft server) is injecting broken commands into the Craftbukkit console. Could be a broken bash script, a crappy wrapper...