Question Method with parameter of Type Scene can not be added to OnClick event

The first two methods can be added to Onclick() events without trouble.
But I cannot select the third one.

What could be the problem here?

Code (CSharp):

1.     public void selectMainWeapon(GameObject weapon){
2.         primary = weapon;
3.     }
4.  
5.     public void selectSecondaryWeapon(GameObject weapon){
6.         secondary = weapon;
7.     }
8.  
9.     public void loadMap(Scene scene){
10.         if(primary != null && secondary != null){
11.             SceneManager.LoadScene(scene.name);
12.         }else{
13.             Debug.Log("Not enough weapons selected");
14.         }
15.     }