What's the cause of "The referenced script on this Behaviour is missing!" in my script?

Hi people! I'm having a problem with my script and i tried everything to end the warning message but I couldn't find what's the cause. I have these two scripts in my scene:

 using UnityEngine;
 using System.Collections;
 
 public class CharacterAssets : MonoBehaviour {
     
     public GameObject[] characterMesh;
     
     void Awake ()
     {
         DontDestroyOnLoad(this);
     }
     
     // Use this for initialization
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
     
     }
 }
 

and...

 using UnityEngine;
 using System.Collections;
 
 public class Customize : MonoBehaviour {
     
     private int characterMeshIndex = 0;
     private string charMeshName = "Warrior";
     private CharacterAssets scriptCA;
     
     // Use this for initialization
     void Start () 
     {
         scriptCA = GameObject.Find("CharacterAssetManager").GetComponent<CharacterAssets>();
         InstantiateCharacterMesh();
     }
     
     
     void OnGUI()
     {
         ChangeCharacterMesh();
     }
     
 
     void InstantiateCharacterMesh() 
     {
         switch(characterMeshIndex)
         {
         case 1:
             charMeshName = "Hunter";
             break;
         case 2:
             charMeshName = "Rogue";
             break;
         default:
             characterMeshIndex = 0;
             charMeshName = "Warrior";
             break;
         }
         if(transform.childCount>0)
         {
             for(int cnt=0 ; cnt < transform.childCount ; cnt++)
             {
                 Destroy(transform.GetChild(cnt).gameObject);
             }
         }
                 
         GameObject mesh = Instantiate(scriptCA.characterMesh[characterMeshIndex], transform.position, Quaternion.identity)as GameObject;
         mesh.transform.parent = transform;
         mesh.transform.rotation = transform.rotation;
     }
     
     
     
     void ChangeCharacterMesh()
     {
         if(GUI.Button(new Rect( Screen.width/2-60 , Screen.height-40 , 120 , 30),charMeshName))
         {
             characterMeshIndex++;
             InstantiateCharacterMesh();
         }
     }
         
         
 }
 

so... the problem is a warning that appears every time that i call the function "InstantiateCharacterMesh" on the second script.

The warning says: The referenced script on this Behaviour is missing! UnityEngine.Object:Instantiate(Object, Vector3, Quaternion) Customize:InstantiateCharacterMesh() (at Assets/Scripts/Customize.cs:47) Customize:Start() (at Assets/Scripts/Customize.cs:14)

The game run and works ok but this warning message is pissing me of! If i simply comment the lines 47,48 and 49, the error disappears(but the code become incomplete i don't do the most important thing that is the instantiate).