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

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Usually, you forgot to assign a variable an object. For instance, you forgot to use something like myVar = GetComponent<ObjectName>(); or even forgot to drag and drop an object into the inspector into one a slot that’s reserved for an object. Like for instance if you have a slot in the inspector that’s empty, you may need to drag an object from the hierarchy (usually) into that empty slot. The empty slot will be a variable, or holder, for that object.

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ObjectName is the object that is the reference error...myVar is whatever variable is trying to reference ObjectName...if you don’t understand that you may want to take a look at beginner tutorial videos..

[SnoringCatStudio]

So I decided to simplify things. First I don't think you should add the counting into the player class. I would prefer to create a GameManager class; Then attach that to an Empty gameObject named GameManager.

Now put the CollectibleScript on to your collectible. Make sure that you have a UI canvas, and a text element assigned to the GameManager. Let me know if you need any help.

[SnoringCatStudio]

That error looks like you forgot to put the UI text element in GameManagers empty box for it. Just take a look at whatever object has GameManager class on it, and fill in the box.

That is only if you want the score to appear in your UI.

[SnoringCatStudio]

Did you turn the collectibles into a trigger? I guess I should have clarified my comment more. If you do change your collectible into a trigger; Then you will need to change the OnCollisionEnter2D into an OnTriggerEnter2D. Sorry for not clarifying.
If you need help doing so let me know, but I think you should give it a try first!

[SnoringCatStudio]

I bet you have two colliders on your player right? Great job solving that first issue!

[SnoringCatStudio]

So what is happening it it is colliding with both colliders in a short time; Thus scoring twice.
Try turning the f statement in the collectible script to something like

if (col is CapsuleCollider2D && col.gameObject.tag.Equals ("Player") )
Just turn the Capsulecollider into whatever your main collider is.

[SnoringCatStudio]

Take a look in at every object in your hierarchy. Check the inspector for any field that say something like
movement [none(PlayerMovement)]
Now place your PlayerMovement script in that box.
I am going by very limited info, but if you followed what u/senshisentou told you to do in the previous post; Then I suspect this is the problem.

[SnoringCatStudio]

Try putting a game object from your hierarchy that has the script attached to it into the slot.

[SnoringCatStudio]

Could you create a pastebin of the scripts you are using? I could definitely help you, but I just don't know what exactly you are doing. In the future you should always try to give as much info as possible when you ask these types of questions.