Another Error Accessing Components

I am basically trying to access variables and add or subtract them from different scripts but right now im getting this error... For more info see my last post http://answers.unity3d.com/questions/132845/errors-while-accessing-components.html

 Assets/My Assets/Scripts/NPC/NPC_AI.cs(28,42): error CS1061: Type object' does not contain a definition forXP' and no extension method XP' of typeobject' could be found (are you missing a using directive or an assembly reference?)

For this Script

 using UnityEngine;
 using System.Collections;
 
     public class NPC_AI : MonoBehaviour {
 
         public float Speed = 6.0f;
         public float rotateSpeed = 6.0f;
         public int Range = 20;
         
         public int minHealth = 1;
         public int curHealth = 100;
         public int maxHealth = 100;
         
         public int GiveXP = 10;
         
         public Transform Player;
 
         // Use this for initialization
         void Start () {
     
         }
     
         // Update is called once per frame
         void Update () {
         
         if(curHealth < minHealth) {
             System.Object PlayerController = GetComponent<PlayerController>();
             PlayerController.XP += GiveXP;
         }
     }
 }