Network game. Server not responding(stuck).

Here is the spawn code for the crate:

 using UnityEngine;
 using System.Collections;
 
 public class CrateSpawner : MonoBehaviour {
 
 
     public float spawnTimer = 10.0f;
 
     
 
     public void SpawnCrates()
     {
             if (Network.isServer)
             {
 
         
                 Network.Instantiate (Resources.Load ("Prefabs/crate2"), t$$anonymous$$s.transform.localPosition, t$$anonymous$$s.transform.rotation, 0);
             }
     }    
 
 
     void Update () {
 
         if (spawnTimer <= 0) {
         
             SpawnCrates();
             spawnTimer = 60.0f;
                 }
 
         else {
             spawnTimer -= Time.deltaTime; 
 
     }
 }
 
 }