Object reference not set to an instance of an object, but the object was just instantiated. Help!

So, I have a bit of experience with Unity and now have found an error which I can't understand.

The console says that the object I'm referring to isn't instantiated, but the variable was created like this:

Code (CSharp):

1. GameObject newPiece = Instantiate(availablePieces[selectedFrame], gameManager.transform);

Then the reference to the GameObject is passed to another Component that is instantiated but has no issues and then goes into a non MonoBehaviour script and it gives me an error when doing so in these lines of code (the second one to be more specific):

Code (CSharp):

1. Piece pieceComponent = newPiece.GetComponent(typeof(Piece)) as Piece;
2.  
3. tileMap[x, y].ChangePiece(pieceComponent);

I don't understand the error as the object reference is already instantiated, so I don't know how to fix it.

All help is appreciated!

 

Did you allocate whatever object is supposed to go into tileMap[x,y] first?

 

Thank you!

I was thinking the problem was with the instance of the GameObject but now I found out that I have another problem with filling in the tileMap array (it was supposed to be filled with some default tiles but it isn't working right now).

 

The best laid plans of mice and men are often uninitialized.