Time Delay not working

Hello, I need some help. I was trying to figure out how Time Delay worked and I think I did it correctly. However, a few error signs pop up. Can you please explain them to me and how to fix? I am new at programming, so I spend most of my time trying to find tutorials and debug stuff.

Script:
using UnityEngine;
using UnityEngine.SceneManagement;

public class Playercollision : MonoBehaviour
{

public Playermovement movement;
public Jumpingmechanic jump;
public Rigidbody rb;

void OnCollisionEnter (Collision collision)
{

iEnumerator Timedelay();
{


yield return new WaitForSeconds(3);

SceneManager.LoadScene("Gamemover scene");
}

if (collision.collider.tag == "Obstacle")
{
movement.enabled = false;
StartCoroutine(Timedelay());

}


if (collision.collider.tag == "jump")
{

jump.enabled = true;

}

if (collision.collider.tag == "recovery")
{

movement.enabled = true;
rb.drag = 2;
jump.enabled = false;


}
}
}

My errors:
1.
Assets\Scripts\Playercollision.cs(14,14): error CS8112: 'Timedelay()' is a local function and must therefore always have a body.

2.
Assets\Scripts\Playercollision.cs(14,2): error CS0246: The type or namespace name 'iEnumerator' could not be found (are you missing a using directive or an assembly reference?)

3.
Assets\Scripts\Playercollision.cs(11,10): error CS1624: The body of 'Playercollision.OnCollisionEnter(Collision)' cannot be an iterator block because 'void' is not an iterator interface type

They make no sense because when I remove the Bracket at line 21, the errors have been replaced with
Assets\Scripts\Playercollision.cs(48,2): error CS1513: } expected.
Is this normal? I have no idea. Thanks!

 

That should fix it:

you need to create a function IEnumerator,
you cannot create a function inside another

Code (CSharp):

1. public class Playercollision : MonoBehaviour
2. {
3.  
4.     public Playermovement movement;
5.     public Jumpingmechanic jump;
6.     public Rigidbody rb;
7.  
8.     public IEnumerator LoadSceneWithDelay(float time)
9.     {
10.         yield return new WaitForSeconds(time);
11.         SceneManager.LoadScene("Gamemover scene");
12.     }
13.  
14.     void OnCollisionEnter (Collision collision)
15.     {
16.  
17.  
18.         StartCoroutine(LoadSceneWithDelay(5));
19.  
20.          
21.         if (collision.collider.tag == "Obstacle")
22.         {
23.             movement.enabled = false;
24.             StartCoroutine(Timedelay());
25.          
26.         }
27.      
28.    
29.         if (collision.collider.tag == "jump")
30.         {
31.          
32.             jump.enabled = true;
33.  
34.         }
35.      
36.         if (collision.collider.tag == "recovery")
37.         {
38.          
39.             movement.enabled = true;
40.             rb.drag = 2;
41.             jump.enabled = false;
42.  
43.          
44.         }
45.       }  
46. }

 

Thanks! I think I've got it.