How to remove local is undeclared prefix error - xamarin

Question

I am trying to follow this tutorial. https://www.youtube.com/watch?v=mBlzs5owIEY
I am able to populate a listview with some data, the listview is displaying the correct data when i'm running the emulator.
Could you please explain what is the meaning of the error below?
I want to understand what is causing it, and how do I resolve the issue?
Error
Severity Code Description Project File Line Suppression State
Error 'local' is an undeclared prefix. Line 7, position 10. C:\Workspaces\HelloWorld\App1\App1\App1\XAML\ListView.xaml 7
App.xaml
using System;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace App1
{
public partial class App : Application
{
public App()
{
InitializeComponent();
MainPage = new ListView();
}
protected override void OnStart()
{
}
protected override void OnSleep()
{
}
protected override void OnResume()
{
}
}
}
Debtviewmodel.cs
using System;
using System.Collections.Generic;
using System.Text;
namespace App1
{
class DebtViewModel
{
public string[] Debt { get; set; }
public DebtViewModel()
{
string[] debt = new string[] { "1", "2", "3" };
Debt = debt;
}
}
}
ListView.xaml
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:App1"
mc:Ignorable="d"
x:Class="App1.ListView">
<!-- Required to map viewmodel -->
<ContentPage.BindingContext>
<local:DebtViewModel />
</ContentPage.BindingContext>
<!-- Bind variable in view model to listview itemsource -->
<ContentPage.Content>
<StackLayout>
<ListView x:Name="lvDebt" ItemsSource="{Binding Debt}">
</ListView>
</StackLayout>
</ContentPage.Content>
</ContentPage>