Stealth Tutorial Lift Doors don't open NullReferenceException

Hello. This is the first tutorial I have tried with Unity. I have retried the “Lift” section of the tutorial a few times, always with the same issue. The inner doors do not open and I get this Null Reference Exception:
NullReferenceException UnityEngine.Transform.get_position () (at C:/BuildAgent/work/7535de4ca26c26ac/Runtime/ExportGenerated/Editor/UnityEngineTransform.cs:26) LiftDoorsTracking.DoorFollowing () (at Assets/Scripts/LevelDynamics/LiftDoorsTracking.cs:50) LiftTrigger.Update () (at Assets/Scripts/LevelDynamics/LiftTrigger.cs:65)
The issue appears to be this:
MoveDoors(leftOuterDoor.position.x, rightOuterDoor.position.x);

I have no idea what to change.

Hi there,

In the LiftDoorsTracking script look at lines 21 - 24, and make sure the names of the child objects for both the outer exit doors and the lift inner doors match the names in the script. For example, mine look like this:

    leftOuterDoor = GameObject.Find("door_exit_outer_left").transform;
    rightOuterDoor = GameObject.Find("door_exit_outer_right").transform;
    leftInnerDoor = GameObject.Find("door_exit_inner_left").transform;
    rightInnerDoor = GameObject.Find("door_exit_inner_right").transform;

Hope this helps