Server ERROR

[CHR]

Hey People since a restart of my Server i get this error and it dosnt start anymore...

NullReferenceException: Object reference not set to an instance of an object
at AISense.AddTarget (.BaseCombatEntity entity) [0x00000] in <filename unknown>:0

at AISense.InsertTarget (.HitInfo hit) [0x00000] in <filename unknown>:0

at NPCAI.OnAttacked (.HitInfo hit) [0x00000] in <filename unknown>:0
UnityEngine.Component:SendMessage(String, Object, SendMessageOptions)
NPCAttack:Hit(BaseCombatEntity, Single, Boolean)
AttackAction:Tick(Tree)
AIAction:TickFoward(Tree)
BTRustT1:TickAgent(Int32, Boolean, Tree, String, Single)
BTRustT0:Tick1(Tree)
BTRustT0:Tick2(Tree)
BTRustT0:Tick2(Tree)
BTRustT0:Tick(IAgent, Tree, Object)
BTRustT1:Tick1(Tree)
BTRustT1:Tick11(Tree)
BTRustT1:Tick(IAgent, Tree, Object)
Behave.Runtime.Tree:ForceTick()
Behave.Runtime.Tree:Tick()
Behave.Runtime.Tree:TickWrapping(Boolean)
NPCAI:Body()
NPCAI:Tick()
AIHandler:InternalCycle()
AIHandler:Cycle()
ServerMgr:Update()

(Filename: Line: -1)

NullReferenceException: Object reference not set to an instance of an object
at AIDecider.Prioritize () [0x00000] in <filename unknown>:0

at NPCAI.Think () [0x00000] in <filename unknown>:0

at NPCAI.Tick () [0x00000] in <filename unknown>:0

at AIHandler.InternalCycle () [0x00000] in <filename unknown>:0

at AIHandler.Cycle () [0x00000] in <filename unknown>:0

at ServerMgr.Update () [0x00000] in <filename unknown>:0

Im sorry i dont know how to code it in :/ HELP pls