Can not convert from to xamarin form page

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C#

Xamarin

I am trying to Navigate from Page To Page with the click event on my main page but

gives me following error:

Argument 1: cannot convert from 'TESTTwo.Register' to 'Xamarin.Forms.Page'

My Project Named TESTTwo

What I have tried:

My Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace TestTWO
{
public partial class MainPage :ContentPage
{
public MainPage()
{
InitializeComponent();
}

private void Button_Clicked(object sender, EventArgs e)
{
Navigation.PushAsync(new Register());
}
}
}

My Design


<contentpage xmlns="http://xamarin.com/schemas/2014/forms"
="" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:class="TestTWO.MainPage">
<stacklayout>
<stacklayout>