Question How do I fix this

I was following a tutorial as I've never done a 2D project before and trying to make a collision detect script but I keep getting this error

NullReferenceException: Object reference not set to an instance of an object

I don't know why and I've done the exact same as the tutorial. If anyone has any ideas I would appreciate it.
Heres my code

 

What is the line number? The entire error message? First guess: do you actually have BoxCollider2D on your Player game object?
Also please do not post screenshot of code, post the code itself in CODE tags.

 

I do have Boxcollider 2D and here is the full error message

NullReferenceException: Object reference not set to an instance of an object
Player.FixedUpdate () (at Assets/Scripts/Player.cs:32)

I have no idea which thing on the line is incorrect.
Also thanks I will make sure to use the code tag next time

 

Your

boxCollider

is null, you misspelled

Start

.

 

where did I misspell start

edit do I need a capital letter

edit edit I used a capital letter and it still has the same error

 

Well, yes: https://docs.unity3d.com/ScriptReference/MonoBehaviour.Start.html

 

thanks i managed to fix it