The prefab you want to instantiate is null. Tried googling, didn't help.

Hello. I know this question has already been asked a million times, but none of the posts that I have found seem to be working for my situation. I'm trying to make the game fire a bullet when the player left-clicks. The bullet is a prefab, and I'm trying to instantiate it. Here's my code: #pragma strict

 function Start () {
 
     }
 
 function Update () {
 
     //Fire a bullet when the player clicks
     
     if (Input.GetMouseButtonDown(0)){
     
         var bullet_prefab: GameObject;
          Instantiate(bullet_prefab,transform.position,transform.rotation);
          
         }
 
     }

And here's a screenshot of my project so you can see how the prefab is set up:

And here's the player's GameObject so you can see how I have the script put on there, in case that helps.