A* Pathfinding Project question in inheritance

Unity Engine
1

I am using the A* Pathfinding Project but getting a null reference to the IAstarAI when I GetComponent in the top level of inheritance. Same code works when I use it in the lower level. Both scripts are attached to the gameobject.

Anyone got any ideas why this happens?

2

Some notes on how to fix a NullReferenceException in Unity3D (also Unassigned Reference errors):

http://plbm.com/?p=221

The basic steps outlined above are:

  • Identify what is null
  • Identify why it is null
  • Fix that.
3

I found the solution. I changed the start() to Awake(). I am aware the Awake() loads later but still not sure why this fixed the issue.

4

Awake is invoked first.

5

This is incorrect. I suggest you review the Unity Monobehavior event lifecycle chart. It is critical to your successfully engineering solutions within the Unity3D API and framework.

Here is some timing diagram help: