2d Roguelike tutorial error: "The type or namespace name `BoardManager' could not be found"

I’m following the tutorial step by step, but ran into this error. Existing answers didn’t seem to apply to my case.

Assets/Scripts/GameManager.cs(7,16): error CS0246: The type or namespace name `BoardManager’ could not be found. Are you missing a using directive or an assembly reference?

My script looks just like the one in the tutorial vid:

using UnityEngine;
using System.Collections;

public class GameManager : MonoBehaviour 
{
	public BoardManager boardScript;

	private int level = 3;

	void Awake () 
	{
		boardScript = GetComponent<BoardManager>();
		InitGame ();
	}

	void InitGame()
	{
		boardScript.SetupScene(level);
	}
}

I don’t have much c# experience so this may be a beginner’s mistake, but as I said the code looks just like the one in the tutorial as far as I can tell. Thanks in advance for any help!

Add the class BoardManager to the current/same GameObject that GameManager is attached to.