Question about GetComponent

I'm running into a error with the GetComponent portion of my script. Can anybody tell me what I missed? I have the script its looking for attached to the gameobject. But I'm still getting this error in the console

" Type UnityEngine.Object' does not contain a definition for GetComponent' and no extension method GetComponent' of type UnityEngine.Object' could be found (are you missing a using directive or an assembly reference?)"

 using UnityEngine;
 using System.Collections;
 
 public class AirTurret : MonoBehaviour {
     
     public GameObject myProjectile;
     public float reloadTime = 1f;
     public float turnSpeed = 5f;
     public float firePauseTime =.25f;
     public float errorAmount = .001f;
     public Transform myTarget;
     public Transform[] muzzlePositions;
     public Transform pivot_Tilt;
     public Transform pivot_Pan;
     public Transform aim_Pan;
     public Transform aim_Tilt;
     
     private float nextFireTime;
 
     // Use this for initialization
     void Start () {
     }
     
     void Update () {
         if(myTarget)
         {
             aim_Pan.LookAt(myTarget);
             aim_Pan.eulerAngles = new Vector3(0, aim_Pan.eulerAngles.y, 0);
             aim_Tilt.LookAt(myTarget);
             
             pivot_Pan.rotation = Quaternion.Lerp(pivot_Pan.rotation, aim_Pan.rotation, Time.deltaTime * turnSpeed);
             pivot_Tilt.rotation = Quaternion.Lerp(pivot_Tilt.rotation, aim_Tilt.rotation, Time.deltaTime * turnSpeed);
             
             if(Time.time >= nextFireTime)
             {
                 FireProjectile();
             }
         }
     }
     
     void OnTriggerEnter(Collider other )
     {
         if(other.gameObject.CompareTag("Enemy"))
         {
             nextFireTime = Time.time +(reloadTime*.5f);
             myTarget = other.gameObject.transform;
         }
     }
     
     void OnTriggerExit(Collider other)
     {
         if(other.gameObject.transform == myTarget)
         {
             myTarget = null;
         }
     }
     
     void FireProjectile()
     {
 //        audio.Play();
         nextFireTime = Time.time+reloadTime;
         
         int m = Random.Range(0,6);
         var newMissile = Instantiate(myProjectile, muzzlePositions[m].position, muzzlePositions[m].rotation);
         newMissile.GetComponent<Projectile_Missle>().myTarget = myTarget;
     }
 }