error

im getting this weird error, 'Random' is an ambiguous reference between 'UnityEngine.Random' and 'System.Random', and ive looked it up, but i cant find any solution that works about how to fix this error, and i tried everything i found about this error and none of em worked. pls help.


heres my code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5. using System;
6. using System.Threading;
7.  
8. public class NewBehaviourScript : MonoBehaviour
9. {
10.              
11.     // Start is called before the first frame update
12.     public Text Text;
13.     void Start()
14.     {  
15.        
16.         bool rg = true;
17.        
18.         do
19.         {
20.             PlayerPrefs.SetString("Stat", "red");
21.             Random rnd = new System.Random();
22.             int sec  = rnd.Next(1000, 6000);
23.             Thread.Sleep(sec);
24.             PlayerPrefs.SetString("Stat", "green");
25.  
26.            
27.         }while(rg == true);
28.     }
29.     void Update()
30.     {
31.         if(PlayerPrefs.GetString("Stat") == "red") {
32.             Text.text = "Red Light";
33.         }
34.         else{
35.             Text.text = "Green Light";
36.         }
37.     }
38.  
39.  
40. }
41.