Question by DaDarkDan · Jan 28, 2017 at 06:18 PM · c#scripting problem nullreferenceexception patrol finite-state-machine

NullReferenceException in FiniteStateMachine with ThirdPersonCharacter

Hey guys,

I'm receiving an error when I try to move an enemy character from one waypoint to another. I have a Finite State Machine that changes states for the enemy (currently only WAIT and PATROL). It is started as a coroutine. My goal is that the enemy walks to waypoint 1 (state = PATROL) then waits for a while (state = WAIT) (patrolWaitingTime) and walks to the next waypoint (state = PATROL).

  private void Update() {
         target = wayPoints[wayPointIndex];
         if (target != null) {
             agent.SetDestination(target.position);
         }
         if (state == State.WAIT) {
             elapsedWaitingTime += Time.deltaTime;
         }
     }
 
     private void Patrol() {
         if (agent.remainingDistance > agent.stoppingDistance) {
             character.Move(agent.desiredVelocity, false, false);
         } else {
             state = State.WAIT;
         }
     }
 
     private void Wait() {
         character.Move(Vector3.zero, false, false);
         if (elapsedWaitingTime > patrolWaitingTime) {
             wayPointIndex++;
             if (wayPointIndex == wayPoints.Length) {
                 wayPointIndex = 0;
             }
             elapsedWaitingTime = 0;
             state = State.PATROL;
         }
     }

Sorry for the long Code but I cannot really locate the error. The problem occurs when it first calls "character.Move" in the Wait-function and it goes back to the standard asset script "ThirdPersonCharacter" line 215:

             m_Animator.applyRootMotion = true;

My guess is that it has something to do with the coroutine but I'm a little lost there...I got the full Code attached here and a picture so visualize it :) alt text I really appreciate any help.