[SOLVED] Need help with my OnTriggerEnter code.

Hi guys. I'm using unity 5.2.2 and I'm having a problem with my code.

 using UnityEngine;
 using System.Collections;
 
 public class Door1 : MonoBehaviour {
 
     Animator animator;
     bool doorOpen;
 
     void Start()
     {
         doorOpen = false;
         animator = GetComponent<Animator>();
     }
 
     void OnTriggerEnter(Collider col)
     {
         if (col.gameObject.tag == "Player") {
             doorOpen = true;
             DoorControl ("Open");
             Debug.Log (123);
         }
     }
 
     void DoorControl(string direction)
     {
         animator.SetTrigger(direction);
         Debug.Log (321);
     }
 }

When the player hits the trigger it says this in the console.

Parameter type 'Open' does not match. UnityEngine.Animator:SetTrigger(String)