How to get button component in Unity 2019.3

I have a simple class attached to a button in Unity Canvas:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

public class AudioButtonPlay : MonoBehaviour
{
    public Button button;
    void Start()
    {
        button =  gameObject.GetComponent<Button>();
    }
}

But on the line button = gameObject.GetComponent<Button>(); I get the following message:

GetComponent requires that the requested component 'Button' derives from MonoBehaviour or Component or is an interface

How can I access the "Button" component?