Error while coding

i can’t seem to fix this error… here’s the code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class DialogOpener : MonoBehaviour, IInteractable
{
  public QD_Dialogue reference;
  public string dialogue = "stupid horse";
  public void Interact(){
    reference.Start();
  }
  public string GetDescription();
  {
    return dialogue;
  }
}