Problem at spawning script

I have a problem with this spawning script and I don't know how to repair it.
using UnityEngine;
using System.Collections;

public class Spawn : MonoBehaviour {

public GameObject[] eggs;
private float time;
public float timelimit=0.5f;
bool spot=false;
void Start () {

}

void Update () {

time += Time.deltaTime;
if (time >= timelimit) {
time = 0;
StartCoroutine(Spwn());
}
}
public void Spot(bool x)
{
spot = x;
}
IEnumerator Spwn()
{
while(!spot)
{
spot=true;
Instantiate(Random.Range(0f,11f), new Vector3(Random.Range (-37.31105f,51.35894f), 0f,Random.Range (-115.5185f,-189.02f)), Quaternion.identity) as GameObject;
yield return null;
}
}
}

 

use the Code Tags
Also you should explain what your problem is and post any error messages that unity gives you in the console.

 

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Spawn : MonoBehaviour {
5.  
6.     public GameObject[] eggs;
7.     private float time;
8.     public float timelimit=0.5f;
9.     bool spot=false;
10.     void Start () {
11.        
12.     }
13.  
14.     void Update () {
15.    
16.         time += Time.deltaTime;
17.         if (time >= timelimit) {
18.             time = 0;
19.             StartCoroutine(Spwn());
20.         }
21.     }
22.     public void Spot(bool x)
23.     {
24.         spot = x;
25.     }
26.     IEnumerator Spwn()
27.     {
28.         while(!spot)
29.         {
30.             spot=true;
31.             Instantiate(Random.Range(0f,11f), new Vector3(Random.Range (-37.31105f,51.35894f), 0f,Random.Range (-115.5185f,-189.02f)), Quaternion.identity) as GameObject;
32.             yield return null;
33.         }
34.     }
35. }
36.  

Sorry for the post, i didn't know about the code tag and the error is: Assets/Spawn.cs(31,182): error CS0201: Only assignment, call, increment, decrement, and new object expressions can be used as a statement, at the 31st line

 

You are trying to Instantiate a float value... should be a gameobject

Code (csharp):

1.  
2. Instantiate(prefabName, newVector3(Random.Range(-37.31105f,51.35894f), 0f,Random.Range(-115.5185f,-189.02f)), Quaternion.identity)asGameObject;
3.