can not move my enemy with rigidbody

I need my enemy to target the player and move towards the player and attack without moving through walls. My script used to work(everything except moving through walls) but I changed it to try to make the enemy not move through walls and now the enemy won't move at all. I attached a rigidbody, a character motor, a box collider, and a character controller. Heres my EnemyAI script.

 using UnityEngine;
 using System.Collections;
 
 public class EnemyAI : MonoBehaviour {
     public Transform target;
     public int moveSpeed;
     public int rotationSpeed;
     private Transform myTransform;
     public int maxDistance; 
     // Use this for initialization
     void Awake () {
     myTransform = transform;
     }
     void Start(){
     GameObject go = GameObject.FindGameObjectWithTag("player");
     target = go.transform;
     maxDistance = 2;
     }
     // Update is called once per frame
     void FixedUpdate () {
     myTransform.rotation = Quaternion.Slerp (myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);
     if(Vector3.Distance(target.position, myTransform.position) > maxDistance) {
         rigidbody.velocity = transform.TransformDirection(new Vector3(0,0, moveSpeed));
     }
 }

}