Door Script compiler error

I have written a script and every time I try to play the game I get a constant Error of 'error CS0103 : The name 'Global' does not exist in the current context'. I have been trying to fix this for the past few hours and have no idea why it isn't working. My script is:

     // Use this for initialization
     void Start () 
     {
         myAudio = GetComponent<AudioSource>();
         myAudio.enabled = false;
     }
     
     IEnumerator DoorMotionCo(Vector3 target)
     {
         Vector3 targetInverse = new Vector3(-target.x,target.y,target.z);
         
         
         while(Vector3.Distance(myDoor1.transform.localPosition, target) >= snapTo)
         {
             Debug.Log ("Door Running");
             myDoor1.transform.localPosition = Vector3.Lerp(myDoor1.transform.localPosition, target, moveSpeed * Time.deltaTime);
             myDoor2.transform.localPosition = Vector3.Lerp(myDoor2.transform.localPosition, targetInverse, moveSpeed * Time.deltaTime);
             yield return null;
         }
         
         myDoor1.transform.localPosition =  target;
         myDoor2.transform.localPosition = targetInverse;
         yield return null;
     }
     
     void OnTriggerEnter(Collider col)
     {
         if (col.gameObject.tag == "Player"  && Global.haveKey01 == true)
         {
             StopCoroutine ("DoorMotionCo");
             StartCoroutine("DoorMotionCo", new Vector3 (doorMove, 0f,0f));
             
             myAudio.enabled = false;
             myAudio.enabled = true;
         }
     }
     
     void OnTriggerExit(Collider col)
     {
         if (col.gameObject.tag == "Player" && Global.haveKey01 == true)
         {
             StopCoroutine ("DoorMotionCo");
             StartCoroutine("DoorMotionCo", Vector3.zero);
             
             myAudio.enabled = false;
             myAudio.enabled = true;
         }
     }
 }