Cannot cast from source type to destination type

I want to make a pokemon lke game, where the player has to recognize the tile he is on.

This is the complete Error Log :

InvalidCastException: Cannot cast from source type to destination type. (wrapper dynamic-method) UnityEngine.RaycastHit.RaycastHit$get_collider$ (object,object[]) Boo.Lang.Runtime.RuntimeServices.GetProperty (object,string) UnityScript.Lang.UnityRuntimeServices.GetProperty (object,string) Movement.calculateTileOn () (at Assets/scripts/Movement.js:96) Movement.Update () (at Assets/scripts/Movement.js:29)

This is my script: var startPoint : Vector3; var endPoint : Vector3; var speed : float; private var increment : float; var isMoving : boolean; var tileSpace : float; var tileOn : String; var tile : GameObject []; var tileStatts;

function Start () {

 startPoint =  transform.position;
 endPoint = transform.position; 

}

function Update () {

 calculateTileOn ();
 
 
 if(increment <=1 && isMoving == true){
     increment += speed/100;
     }
 else{
     isMoving = false;
 
 }
 if(isMoving){
     transform.position = Vector3.Lerp(startPoint, endPoint, increment);
     
 }
 if(Input.GetButton("forward") && isMoving == false){
     increment = 0;
     isMoving = true;
     startPoint = transform.position;
     endPoint = new Vector3(transform.position.x, transform.position.y + tileSpace, transform.position.z );
     
 }    
 
 if(Input.GetButton("backward") && isMoving == false){
     increment = 0;
     isMoving = true;
     startPoint = transform.position;
     endPoint = new Vector3(transform.position.x, transform.position.y - tileSpace, transform.position.z );
     
 }    
 
 if(Input.GetButton("left") && isMoving == false){
     increment = 0;
     isMoving = true;
     startPoint = transform.position;
     endPoint = new Vector3(transform.position.x - tileSpace, transform.position.y, transform.position.z );
     
 }    
 
 if(Input.GetButton("rigth") && isMoving == false){
     increment = 0;
     isMoving = true;
     startPoint = transform.position;
     endPoint = new Vector3(transform.position.x + tileSpace, transform.position.y, transform.position.z );
     
 }    
 

}

function calculateTileOn() {

 var hit = RaycastHit;
 
     if(Physics.Raycast(transform.position, -Vector3.up)) {
         print("The thunder has been let down, Sir");
     
     
     }
     
     if(hit.collider.gameObject.Tag){
         tileOn = hit.collider.gameObject.Tag;
         tile =  GameObject.FindGameObjectsWithTag (tileOn);
         tileStatts = tile.Tile;
         
         
     }
     
     
     
         

}

And This is my Tiles script:

class Tiles {

var name : String;

var pokemonCount : float;

var walkable : boolean;

var swimable : boolean;

}