I got an error after following the lecture: NullReferenceException: Object reference not set to an instance of an object
Pathfinder.Awake () (at Assets/Pathfinding/Pathfinder.cs:24)
my Awake method:
void Awake()
{
{
grid = gridManager.Grid;
}
startNode = new Node(startCoordinates, true);
destinationNode = new Node(destinateCoordinates, true);
}Where do you assign gridManager? That’s probably where the error comes from.
Because I had a different problem before, I just copied the gitHub Commit from this lecture:
public class GridManager : MonoBehaviour
{
[SerializeField] Vector2Int gridSize;
Dictionary<Vector2Int, Node> grid = new Dictionary<Vector2Int, Node>();
public Dictionary<Vector2Int, Node> Grid { get { return grid;} }
void Awake()
{
CreateGrid();
}
public Node GetNode(Vector2Int coordinates)
{
if(grid.ContainsKey(coordinates))
{
return grid[coordinates];
}
return null;
}
void CreateGrid()
{
for(int x = 0; x < gridSize.x; x++)
{
for(int y = 0; y < gridSize.y; y++)
{
Vector2Int coordinates = new Vector2Int (x,y);
grid.Add(coordinates, new Node(coordinates, true));
}
}
}
}
Many Thanks once again!
Yes, There’s a grid manager component, but you are referencing a variable that has not been assigned to it
how do i fix it? how do i assign it?
Many Thanks!
From the course repo:
void Awake()
{
gridManager = FindObjectOfType<GridManager>();
if(gridManager != null)
{
grid = gridManager.Grid;
}
startNode = new Node(startCoordinates, true);
destinationNode = new Node(destinateCoordinates, true);
}
thank you so much!
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