How to instantiate a prefab declared in one script, from another script

T$$anonymous$$s is script one:

     public GameObject chatContent;
    //t$$anonymous$$s gameobject is referenced in the editor

     public void Start()
         {
             AddMessage("T$$anonymous$$s is ok");
         }
         void OnEnable()
         {
             EventSystemManager.StartListening("messageArrived", AddMessage);     
         }
         public void AddMessage(string message ) {
             print("One");
             GameObject remoteMessage = Instantiate(localMessagePrefab, chatContent.transform) as GameObject;
             print("Two" );
             remoteMessage.transform.GetC$$anonymous$$ld(0).GetComponentInC$$anonymous$$ldren<Text>().text = message;
             print("Three");
             DestroyMessage();
         }
 

The method AddMessage executed in Start method works nice, and also i can execute AddMessage several time in the script. The problem is that if i execute t$$anonymous$$s method AddMessage from another script it only get up to the print("One") in the method but the prefab is never instantiated. I have tried to do it by events and also referencing gameobject from the editor but not$$anonymous$$ng works. The method is executed but the instatiation fails with no errors.

T$$anonymous$$s is script two with events:

  private async void onMessageHandler(string e)
     {
         serverMessage = JsonUtility.FromJson<serverMssg>(e);
         EventSystemManager.TriggerEvent("messageArrived", serverMessage.normmsg);
         await miaApi.queueAnim(serverMessage.normmsg);
     }

TIA!