WorldGuard randomly closing my server?

So everytime i go into my server console its just a string of errors for god knows what. Every like say 45 minutes my server just randomly says "Server Closed".... I asked my server host if it was their fault and they said the errors are from WorldGuard... I have no idea how to read or whatever to error reports so here is the pastebin link to a little bit of my log:

http://pastebin.com/9urrpuUr

Have Fun!

Also here is a list of my plugins:

AutoMessage
Buymagic
Buycraft
CombatTag
Essentials
EssentialsChat
EssentialsGroupManager
EssentialsSpawn
Factions
Mobarena
NoCheatPlus
NoRain
PvPTimer
RestrictCreative
SuperSimpleSpawners
Vault
WorldBorder
WorldEdit
WorldGuard
iDisguise
mcMMO

Wow thats alot of plugins but yeah.... Thanks!

 

WorldGuard is having some error issues unforunately. I've had that happen to with the world guard errors, but I found a world guard that is fine with no errors and its updated to 5.7 now! Here's the link http://dev.bukkit.org/media/files/664/680/worldguard-5.7.zip