more info

1. What OS are you using (Brand and version - Ex. Windows XP SP3)?
Windows 7 Home Premium N
2. What architecture is the OS you are running (x64 or x86)?
x86
3. What version and architecture is your java install?
I run Java 7
4. Are you running any wrappers? McMyAdmin, mcadmin, Hamachi, etc?
No, i start the serevr myself.
5. What build of CraftBukkit are you running? (do NOT say latest. Say the build number.)
1.2.5-R4.0
6. What command are you using to run your CraftBukkit server?
I am using Bukkit GUI (http://dev.bukkit.org/server-mods/bukkitgui) to start and administrate the server.
7. What plugins are you running?
Plugins (38): Better Leveling, Ptweaks, WorldEdit, LaggClear, MyDrops, MantaMobControl, Vault, PvPToggle, PermissionsEx, MobBountyReloaded, WorldGuard, SimpleJail, EasyVanish, iConomy, AuthMe, BKCommonLib, ColorMe, SimpleSpleef, FirstJoinPlus, Modifyworld, AutoSaveWorld, Announcements, MobArena, MobDisguise, QwickTree, AutoAnnouncer, Essentials, SimpleJailCells, ChatManager, EssentialsProtect, EssentialsSpawn, LWC, PreciousStones, NoLagg, ChestShop, EssentialsChat, Factions, AntiCheat
8. What error are you getting (post your server.log file)?
Error:
21:01:07 [SEVERE] java.lang.NullPointerException
21:01:07 [SEVERE]    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
21:01:07 [SEVERE]    at java.lang.Double.parseDouble(Unknown Source)
21:01:07 [SEVERE]    at info.hawksharbor.MobBounty.MobBountyReloaded$11.getValue(MobBountyReloaded.java:933)
21:01:07 [SEVERE]    at info.hawksharbor.MobBounty.Metrics.postPlugin(Metrics.java:451)
21:01:07 [SEVERE]    at info.hawksharbor.MobBounty.Metrics.access$500(Metrics.java:69)
21:01:07 [SEVERE]    at info.hawksharbor.MobBounty.Metrics$1.run(Metrics.java:296)
21:01:07 [SEVERE]    at org.bukkit.craftbukkit.scheduler.CraftWorker.run(CraftWorker.java:34)
21:01:07 [SEVERE]    at java.lang.Thread.run(Unknown Source)
Server.log file , here: http://pastebin.com/EHVvjeg0
9. What have you tried already?
Nothing, because i dont know what to do.
10. Have you tried any of the things below?
Yes, some of them.