Citizens 1.4.2 Error

When restarting the server, I get this error:

Code:

58:51 [WARNING] [Citizens] Task #29 for Citizens v1.2.1 generated an exception
java.lang.NoSuchMethodError: net.minecraft.server.MinecraftServer.E()Ljava/security/KeyPair;
        at net.citizensnpcs.resources.npclib.CraftNPC.<init>(CraftNPC.java:27)
        at net.citizensnpcs.resources.npclib.NPCSpawner.spawnNPC(NPCSpawner.java:64)
        at net.citizensnpcs.resources.npclib.NPCManager.register(NPCManager.java:112)
        at net.citizensnpcs.Citizens.setupNPCs(Citizens.java:291)
        at net.citizensnpcs.Citizens.access$0(Citizens.java:278)
        at net.citizensnpcs.Citizens$3.run(Citizens.java:262)
        at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:53)
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
        at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:522)
        at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:215)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:486)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:419)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:818)

Has anyone else got this?

Plugin list:
Plugins (59): ColourMotd, VoxelSniper, speedKick, Vault, Backpack, Multiverse-Core, Parachute, TopPVP, dynmap, SurvivalGames, ShelfIt, mcMMO, MobArena, Citizens, StrangeWeapons, rMessages, WorldEdit, Courier, Multiverse-Inventories, ArmorAbilities, TagAPI, Multiverse-NetherPortals, Header, PermissionsEx, LogBlock, Paintball, VoidSickness, WorldGuard, OddItem, BuildersPlot, HeroicDeathPlus, ChestRestock, CraftBookCommon, pvparena, BKCommonLib, Lockette, FirstJoinPlus, SimpleSpleef, Modifyworld, AutoSaveWorld, Herochat, CraftingPlus, Essentials, WorldBorder, CraftBookMechanisms, ServerSigns, Multiverse-Portals, AntiRelog, NoLagg, ChatManager, EssentialsProtect, EssentialsSpawn, NameTags, BOSEconomy, Monster Apocalypse, Dynmap-HeroChat, Factions, Dynmap-Factions, ChestShop

 

Your error message says "Citizens v1.2.1" which is for Minecraft version 1.3.1.
Why would you use it for 1.4.2? Try using 2.0.2 instead or a dev build of Citizens 2 available here.
http://ci.citizensnpcs.com/job/Citizens2/

 

Try using an Updated Version of Citizens, if that doesn't work that means Citizens isn't ready for 1.4.2 yet