GetRemainingDistance只能在放置在NavMesh上的活动代理上调用

我有两个错误：

第一个错误是：

MissingComponentException：没有"NavMeshAgent"附加到"ThirdPersonController"游戏对象，但脚本正在尝试访问你可能需要在游戏对象中添加一个NavMeshAgent"ThirdPersonController"。或者您的脚本需要检查组件在使用前已连接。

Patrol.Update（）（位于Assets/My Scripts/Patrol.cs:41）

Patrol.Update在我创建的一个名为Patrol.cs 的脚本文件中

using UnityEngine;
using System.Collections;
public class Patroll : MonoBehaviour {
    public Transform[] points;
    private int destPoint = 0;
    private NavMeshAgent agent;
    // Use this for initialization
    void Start () {
        agent = GetComponent<NavMeshAgent>();
        // Disabling auto-braking allows for continuous movement
        // between points (ie, the agent doesn't slow down as it
        // approaches a destination point).
        agent.autoBraking = false;
        GotoNextPoint();
    }
    void GotoNextPoint() {
        // Returns if no points have been set up
        if (points.Length == 0)
            return;
        // Set the agent to go to the currently selected destination.
        agent.destination = points[destPoint].position;
        // Choose the next point in the array as the destination,
        // cycling to the start if necessary.
        destPoint = (destPoint + 1) % points.Length;
    }

    void Update () {
        // Choose the next destination point when the agent gets
        // close to the current one.
        if (agent.remainingDistance < 0.5f)
            GotoNextPoint();
    }
}

第41行是：

if (agent.remainingDistance < 0.5f)

这个脚本Patrol.cs我拖到层次结构到ThirdPersonController。

然后在这之后，我有另一个错误，这个错误我甚至在创建Patrol.cs脚本之前也有：

"GetRemainingDistance"只能在具有已放置在NavMesh上。UnityEngine.NavMeshAgent:get_remainingDistance（）UnityStandardAssets.Characters.ThirdPerson.AICharacterControl:Update（）（按资产/标准Assets/Characters/ThirdPersonCharacter/Scripts/AICharacterControl.cs:31）

此错误出现在脚本AICharacterControl.cs中，它是统一脚本，也与层次结构中的ThirdPersonController有关。

第31行：

if (agent.remainingDistance > agent.stoppingDistance)

到目前为止，我试图做的是团结一致。我点击了组件>导航>NavMesh Agent 上的菜单

现在它在ThirdPersonController中添加了Nav Nesh Agent，我可以在ThirdPersonController的Inspector中看到Nav NeshAgent部分。

但是错误仍然存在。

这是AICharacterControl.cs脚本

using System;
using UnityEngine;
namespace UnityStandardAssets.Characters.ThirdPerson
{
    [RequireComponent(typeof (NavMeshAgent))]
    [RequireComponent(typeof (ThirdPersonCharacter))]
    public class AICharacterControl : MonoBehaviour
    {
        public NavMeshAgent agent { get; private set; }             // the navmesh agent required for the path finding
        public ThirdPersonCharacter character { get; private set; } // the character we are controlling
        public Transform target;                                    // target to aim for

        private void Start()
        {
            // get the components on the object we need ( should not be null due to require component so no need to check )
            agent = GetComponentInChildren<NavMeshAgent>();
            character = GetComponent<ThirdPersonCharacter>();
            agent.updateRotation = false;
            agent.updatePosition = true;
        }

        private void Update()
        {
            if (target != null)
                agent.SetDestination(target.position);
            if (agent.remainingDistance > agent.stoppingDistance)
                character.Move(agent.desiredVelocity, false, false);
            else
                character.Move(Vector3.zero, false, false);
        }

        public void SetTarget(Transform target)
        {
            this.target = target;
        }
    }
}

我想不出如何改正这些错误。