Server crashes every once in a while

So my server crashes sometimes, and i'm not exactly sure why. It happens quite randomly, but here is the log.

Console:
http://pastebin.com/urqt0aE1

Log file it created:
http://pastebin.com/qf0hAhGD

 

Whats your plugin list?

 

I know it's quite a list and I probably shouldn't be running so many plugins, but...

GroupManager, Vault, Multiverse-Core, NoobResponse, Swearjar, TalkAs, RemoteToolkitPlugin, ChestRegen, WarpSigns, Worldgen, Permissions, OpenInv, SwissBook, ProtocalLib, Votifier, TimTheEnchanter, Citizens, SimpleVoteListener, WorldEdit, CreativeGates, TagAPI, Sign Lift, StandardBooks, PlayerHeads, LWC, WorldGuard, IP-Check, PayForAccess, CoreProtect, CraftBukkitUpToDate, Turnstile, Minepay, ColorMe, Turrets, AutoSavePlus, SimpleSpawn, Essentials, Multiverse-Portals, RPG Items, Dynmap, DisguiseCraft, Sentry, Chestshop, EssentialsChat, BattleArena, NameTags, ArenaSpleef, JSONAPI, VanishNoPacket.

(51)

 

51 plugins!?!?!?
That's a lot, I had like 56 plugins on my server, it crashed every 5 hours, having that much plugins isn't really good, Try to remove a few plugins.

 

InspectorFacepalm Please do not reply in the Bukkit Help forum if you do not have a solution.

 

I thought if you had over 45 plugins and not good server specs your server would crash :i

 

ChaoticTrack your crash is a particularly unpleasant one because it's not immediately traceable to a plugin. If you are interested, I'd be happy to PM you with instructions on how we can find out which plugin or plugins are causing it. Just send me a PM