Server Crashes Overtime???

Hello Community,
Recently I've been having an issue ever since the 1.4.4 dev build up to the recommended build 1.4.5 my server has been crashing overtime since this is a 24/7 server but get this 1.4.4 and below it did not do this what so ever I would like to find out whats causing this and fix it right away!

Error Report

Code:

2012-11-20 01:22:39 [SEVERE] net.minecraft.server.ReportedException: Ticking entity
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:581)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
2012-11-20 01:22:39 [SEVERE] Caused by: java.lang.NoSuchMethodError: net.minecraft.server.EntityLiving.az()Lnet/minecraft/server/EntitySenses;
2012-11-20 01:22:39 [SEVERE] at net.citizensnpcs.util.NMS.updateSenses(NMS.java:284)
2012-11-20 01:22:39 [SEVERE] at net.citizensnpcs.npc.entity.EntityHumanNPC.j_(EntityHumanNPC.java:132)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.World.entityJoinedWorld(World.java:1333)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:546)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.World.playerJoinedWorld(World.java:1315)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1193)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
2012-11-20 01:22:39 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
2012-11-20 01:22:39 [SEVERE] ... 4 more
2012-11-20 01:22:39 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.ReportedException: Ticking entity
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:581)
at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NoSuchMethodError: net.minecraft.server.EntityLiving.az()Lnet/minecraft/server/EntitySenses;
at net.citizensnpcs.util.NMS.updateSenses(NMS.java:284)
at net.citizensnpcs.npc.entity.EntityHumanNPC.j_(EntityHumanNPC.java:132)
at net.minecraft.server.World.entityJoinedWorld(World.java:1333)
at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:546)
at net.minecraft.server.World.playerJoinedWorld(World.java:1315)
at net.minecraft.server.World.tickEntities(World.java:1193)
at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
... 4 more

- Deathclockcinema
- Lost Islands Founder Leadhead2015

 

Update or remove citizens.

 

Thats what I thought it was....ok thanks!