Instantiate Random Object at Random Position

         //Thoose are objects that i have;
          
          
         var shooterPlatform : GameObject;
         var wireFrame : GameObject;
         var passObj : GameObject;
         var bareels : GameObject;
      
         //This is array List;
         var randomObject;
          
         //This is the variable of Randomly selected object;  - not required
         // var randomSelect;
          
              
            
             function Awake()
             {
                 //--------------------------------------------------------------------------
                  
                 //At there, Instantiate the object that selected randomly
          
                 randomObject = new Array(shooterPlatform, wireFrame, passObj, bareels);
          
             }
            
             function Update () {
                
                 var randomSelect = Random.Range(0,(randomObject.length)); //since you want to get a random object every time
      
                 var position = transform.TransformPoint(Random.Range(-3.704676, 5.132769), 0, Random.Range(-3.704676, 5.132769));
                
                 //At there, Instantiate the object that selected randomly :S But it isn't worked
                
                 Instantiate(randomObject[randomSelect], position, Quaternion.identity);
                
             }

I wrote this code for random object creation but it says "var randomSelect = Random.Range(0,(randomObject.length)); //since you want to get a random object every time"

I think there is en error Log says me : "lenght' is not a member of 'Object'. "

I'm really confused now.