Unable To spawn Multiple Objects

using UnityEngine; using System.Collections;

public class SpawnScript : MonoBehaviour { public float time; public static int size; private int prop_Number; public float ModValue; public Object[] Spwan_props = new Object[size] ;

 // Use this for initialization
 void Start () 
 {
     InvokeRepeating("spawnArandomProp" , 0.2f , time);
 
 }

 void spawnArandomProp()
 {
     prop_Number = Random.Range(    0,1);
     ModValue*=-1;
     transform.position = new Vector3(Random.Range(-6,6)+ModValue , 5,0);
     Instantiate(Spwan_props[prop_Number] , transform.position , Quaternion.identity);
 }

}