Unity giving me some c sharp errors, cs1061

Hello Unity community! I am getting a problem from a script that I am trying to switch over from unity 4 to 5 in the asset bundle "Simply A*". I am getting three errors, all of level cs1061. I have looked over a few other posts and none have worked in my context. Here's the script:`using UnityEngine; using System.Collections; using System.Collections.Generic;

public class TDManager : MonoBehaviour { public GameObject start; public GameObject end; public GameObject tower; public GameObject ghostTower; public GameObject enemy; public Renderer rend;

 private List<GameObject> towers = new List<GameObject>();

 void Start()
 {
    StartCoroutine(SpawnEnemy());
    rend = GetComponent<Renderer>();
 }
 
 void Update () 
 {
     StartCoroutine(PlaceTowers());
 }

 private RaycastHit CheckPosition()
 {
     Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     RaycastHit hit = new RaycastHit();

     if (Physics.Raycast(ray, out hit, Mathf.Infinity))
     {
         //Make sure to set towers in a grid, by rounding position to an int
         Vector3 newPos = hit.point;
         newPos.Set(Mathf.RoundToInt(newPos.x) - 0.5F, 0.4F, Mathf.RoundToInt(newPos.z) + 0.5F);
         ghostTower.transform.position = newPos;

         //Set color of "show" tower based on the spot being available
         if (hit.transform.tag == "Ground")
         {
             ghostTower.rend.material.color = Color.green;
         }
         else
         {
             ghostTower.rend.material.color = Color.red;
         }
     }
     else
     {
         ghostTower.rend.material.color = Color.red;
     }

     //Return all hit information which we use later
     return hit;
 }

 private IEnumerator PlaceTowers()
 {
     RaycastHit hit = CheckPosition();
     bool canPlace = false;
     //Make sure that we did hit something
     if (hit.transform != null)
     {
         canPlace = (hit.transform.tag == "Ground") ? true : false;
     }

     if (Input.GetButtonDown("Fire1") && canPlace)
     {
         GameObject newTower = Instantiate(tower, new Vector3(Mathf.RoundToInt(hit.point.x) - 0.5F, 0.3F, Mathf.RoundToInt(hit.point.z) + 0.5F), Quaternion.identity) as GameObject;
         towers.Add(newTower);
         yield return new WaitForEndOfFrame();
         Pathfinder.Instance.InsertInQueue(start.transform.position, end.transform.position, CheckRoute);
     }      
 }

 private void CheckRoute(List<Vector3> list)
 {     
     //If we get a list that is empty there is no path, and we blocked the road
     //Then remove the last added tower!
     if (list.Count < 1 || list == null)
     {
         if (towers.Count > 0)
         {
             GameObject g = towers[towers.Count - 1];
             towers.RemoveAt(towers.Count - 1);
             Destroy(g);
         }
     }
 }

 IEnumerator SpawnEnemy()
 {
     yield return new WaitForSeconds(1.5F);
     GameObject e = Instantiate(enemy, start.transform.position, Quaternion.identity) as GameObject;
     e.GetComponent<TDEnemy>().start = start.transform.position;
     e.GetComponent<TDEnemy>().end = end.transform.position;
     StartCoroutine(SpawnEnemy());
 }

} The errors are as follows:Assets/Pathfinding/Scenes/Scripts/TDManager.cs(42,28): error CS1061: Type UnityEngine.GameObject' does not contain a definition for rend' and no extension method rend' of type UnityEngine.GameObject' could be found (are you missing a using directive or an assembly reference?)` then Assets/Pathfinding/Scenes/Scripts/TDManager.cs(46,28): error CS1061: Type UnityEngine.GameObject' does not contain a definition for rend' and no extension method rend' of type UnityEngine.GameObject' could be found (are you missing a using directive or an assembly reference?) and finally, Assets/Pathfinding/Scenes/Scripts/TDManager.cs(51,24): error CS1061: Type UnityEngine.GameObject' does not contain a definition for rend' and no extension method rend' of type UnityEngine.GameObject' could be found (are you missing a using directive or an assembly reference?) Any help would be appreciated, thanks!