I'm getting error: “GetRemainingDistance” can only be called on an active agent how to fix?

I have two errors:

The first erorr is: MissingComponentException: There is no 'NavMeshAgent' attached to the "ThirdPersonController" game object, but a script is trying to access it. You probably need to add a NavMeshAgent to the game object "ThirdPersonController". Or your script needs to check if the component is attached before using it. Patroll.Update () (at Assets/My Scripts/Patroll.cs:41)

The Patroll.Update is in a script file i created called: Patroll.cs

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. publicclassPatroll:MonoBehaviour{
6.  
7. publicTransform[] points;privateint destPoint =0;privateNavMeshAgent agent;
8.  
9. // Use this for initializationvoidStart(){
10.  
11. agent =GetComponent<NavMeshAgent>();
12.  
13. // Disabling auto-braking allows for continuous movement// between points (ie, the agent doesn't slow down as it// approaches a destination point).
14. agent.autoBraking =false;
15.  
16. GotoNextPoint();
17.  
18. }
19.  
20. voidGotoNextPoint(){// Returns if no points have been set upif(points.Length==0)return;
21.  
22. // Set the agent to go to the currently selected destination.
23. agent.destination = points[destPoint].position;
24.  
25. // Choose the next point in the array as the destination,// cycling to the start if necessary.
26. destPoint =(destPoint +1)% points.Length;}
27.  
28.  
29. voidUpdate(){// Choose the next destination point when the agent gets// close to the current one.if(agent.remainingDistance <0.5f)GotoNextPoint();}}

Line 41 is:

Code (csharp):

1.  
2. if(agent.remainingDistance <0.5f)

This script Patroll.cs i dragged over to Hierarchy to ThirdPersonController.

Then after this i have another error and this error i also had even before i created the Patroll.cs script:

"GetRemainingDistance" can only be called on an active agent that has been placed on a NavMesh. UnityEngine.NavMeshAgent:get_remainingDistance() UnityStandardAssets.Characters.ThirdPerson.AICharacterControl:Update() (at Assets/Standard Assets/Characters/ThirdPersonCharacter/Scripts/AICharacterControl.cs:31)

This error is in the script AICharacterControl.cs it's unity script and also related ot the ThirdPersonController in the Hierarchy.

Line 31:

Code (csharp):

1. if(agent.remainingDistance > agent.stoppingDistance)

What i tried to do so far to fix it is in unity i clicked on the menu on Component > Navigation > Nav Mesh Agent

Now it added to the ThirdPersonController the Nav Nesh Agent and i can see in the Inspector of ThirdPersonController the Nav Nesh Agent part.

But the error/s still exist.

This is the AICharacterControl.cs script

Code (csharp):

1.  
2. using System;
3. using UnityEngine;
4.  
5. namespace UnityStandardAssets.Characters.ThirdPerson{[RequireComponent(typeof(NavMeshAgent))][RequireComponent(typeof(ThirdPersonCharacter))]publicclassAICharacterControl:MonoBehaviour{publicNavMeshAgent agent { get;privateset;}// the navmesh agent required for the path findingpublicThirdPersonCharacter character { get;privateset;}// the character we are controllingpublicTransform target;// target to aim for
6.  
7.  
8. privatevoidStart(){// get the components on the object we need ( should not be null due to require component so no need to check )
9. agent =GetComponentInChildren<NavMeshAgent>();
10. character =GetComponent<ThirdPersonCharacter>();
11.  
12. agent.updateRotation =false;
13. agent.updatePosition =true;}
14.  
15.  
16. privatevoidUpdate(){if(target !=null)
17. agent.SetDestination(target.position);
18.  
19. if(agent.remainingDistance > agent.stoppingDistance)
20. character.Move(agent.desiredVelocity,false,false);else
21. character.Move(Vector3.zero,false,false);}
22.  
23.  
24. publicvoidSetTarget(Transform target){this.target = target;}}}

 

Whathappentoyourspacing?

Ok, in all seriousness, this is hard to read. I'm not sure where all your spacing went, but whatever happen to it, you should fix that when sharing code. Also helps to keep lines separate for readability. I'm not sure how your namespace, requiredcomponent, and class name are all on one line.

Now, the only thing I see off hand is your GetComponentInChildren call. Is the navMeshAgent in a child of the object that has this script attached or is it on the same object?

 

Sorry i will fix the main post.

The navMeshAgent i just added to the ThirdPersoncCntroller so i guess it's the same object not a child.

 

You can see the Nav Mesh Agent where i added it. It's inside the ThirdPersonController where also the Patroll script.

 

Since the navmesh and your scripts are on the same object, it should work with getcomponent and not getComponentInChildren. Is it not working for you?

 

No it's not working. I remove my script Patroll.cs from the ThirdPersonController/ Then i tried in the script where the error is show to change it from getComponentInChildren to getcomponent but still same erorr.
The error is not on the ThirdPersonControll script and not in the Patroll.cs script i did. The errorr in the script that come with unity in the file: AICharacterControl.cs at line 31.

Code (csharp):

1.  
2. using System;
3. using UnityEngine;
4.  
5. namespace UnityStandardAssets.Characters.ThirdPerson
6. {
7.     [RequireComponent(typeof (NavMeshAgent))]
8.     [RequireComponent(typeof (ThirdPersonCharacter))]
9.     public class AICharacterControl : MonoBehaviour
10.     {
11.         public NavMeshAgent agent { get; private set; }             // the navmesh agent required for the path finding
12.         public ThirdPersonCharacter character { get; private set; } // the character we are controlling
13.         public Transform target;                                    // target to aim for
14.  
15.  
16.         private void Start()
17.         {
18.             // get the components on the object we need ( should not be null due to require component so no need to check )
19.             agent = GetComponentInChildren<NavMeshAgent>();
20.             character = GetComponent<ThirdPersonCharacter>();
21.  
22.            agent.updateRotation = false;
23.            agent.updatePosition = true;
24.         }
25.  
26.  
27.         private void Update()
28.         {
29.             if (target != null)
30.                 agent.SetDestination(target.position);
31.  
32.             if (agent.remainingDistance > agent.stoppingDistance)
33.                 character.Move(agent.desiredVelocity, false, false);
34.             else
35.                 character.Move(Vector3.zero, false, false);
36.         }
37.  
38.  
39.         public void SetTarget(Transform target)
40.         {
41.             this.target = target;
42.         }
43.     }
44. }

The error is on the line:

Code (csharp):

1. if (agent.remainingDistance > agent.stoppingDistance)

I have on my Hierarchy two characters: AIThirdPersonController and ThirdPersonController.
Main Camera also Terrain.

And the error in this file script was before i added Nav Mesh Agent to the ThirdPersonController before i added my script Patroll.cs to the ThirdPersonController.

This is a link to my project a winrar file the name is My First Game.rar https://1drv.ms/u/s!AtV2OUzEcRzrlm3-x-B607LxMNOw maybe somenoe can look at it see the error.

 

Bake Your Environment And Try Agian

 

I fixed mine by increasing radius of nav mesh agent.

 

I had the same problem and fixed with

Code (CSharp):

1. if (!navMeshAgent.isOnNavMesh)
2.             return;

at the beginning of the function.

This problem appears when we instantiate a prefab and place it to the navmesh.

 

THANKS!

 

You rock! I was getting the "remainingDistance can only be called on an active agent" when spawning my prefabs into the game and having them go to a random location, then once they reach it, go to another random location and repeat that.

That little check at the beginning of my "HasPersonReachedDestination()" method appears to have fixed it. Thanks again!

PS: For anyone who's interested, here's my method to check if an agent has reached their destination (absolutely ridiculous this isn't a built-in method or implemented via callbacks, but whatever):

Code (CSharp):

1. public bool HasNavMeshAgentReachedDestination()
2.     {
3.         // need to check first if the person is spawned and on the navmesh
4.         if (!NavMeshAgent.isOnNavMesh)
5.         {
6.             return false;
7.         }
8.  
9.         if (!NavMeshAgent.pathPending)
10.         {
11.             if (NavMeshAgent.remainingDistance <= NavMeshAgent.stoppingDistance)
12.             {
13.                 if (!NavMeshAgent.hasPath || NavMeshAgent.velocity.sqrMagnitude == 0f)
14.                 {
15.                     return true;
16.                 }
17.             }
18.         }
19.  
20.         return false;
21.     }

 

If you move the player at runtime or by spawning the player in the navmesh that was baked, since it was baked in different position, you will have this error. To overcome this problem just bake again the navmesh. But the solution of clamum is good for solve the problem in runtime. I have got this error because i moved the player from baked player position to a new position. Whem I baked again the player and the navmesh this error did not occurred.

 

You can also add an if check using the NavMeshAgent.isOnNavMesh function. Also check where you're spawning your dudes, make sure you spawn them slightly above the spawning point.

 

check if it can move

 

Make sure that you baked your floor with Navigation Static "Walkable"