Xamarin Forms Error Ispassword

<ContentPage.Content>
    <StackLayout Padding="10,30,10,10" Spacing="10">
        <Label Text="Protected Animal"
               Font="30"
               HorizontalOptions="Center"
               VerticalOptions="Center"/>
        <Label Text="Ingresar al Sistema"                 
               HorizontalOptions="Center"
               VerticalOptions="Center"/>
        <ActivityIndicator x:Name="waitActivityIndicator"
               HorizontalOptions="Center"
               VerticalOptions="Center"/>
        <Label Text="Usuario"                
               HorizontalOptions="Start"
               VerticalOptions="Center"/>
        <Entry x:Name="userEntry"
                Placeholder="Ingresar Usuario"
                HorizontalOptions="FillAndExpand"
                VerticalOptions="Center"/>
        <Label Text="Clave"                
               HorizontalOptions="Start"
               VerticalOptions="Center"/>
        <Entry x:Name="passwordEntry"
                Placeholder="Ingresar clave"
                Ispassword="true"
                HorizontalOptions="FillAndExpand"
                VerticalOptions="Center"/>
        <Button x:Name="enterButton"
            Text="Ingresar"
            BackgroundColor="Navy"
            TextColor="White"
            HorizontalOptions="FillAndExpand"
            VerticalOptions="Center"/>
    </StackLayout>
</ContentPage.Content>

Mark me error in the following:

    <Label Text="Clave"                
           HorizontalOptions="Start"
           VerticalOptions="Center"/>
    <Entry x:Name="passwordEntry"
            Placeholder="Ingresar clave"
            Ispassword="True"
            HorizontalOptions="FillAndExpand"
            VerticalOptions="Center"/>

This is the error message Unhandled exception :

  

Xamarin.Forms.Xaml.XamlParseException: Position 31:21. It can not   assign the property "Ispassword": The property does not exist, or is not   assignable, or does not match between value and property

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Xamarin.Forms;

namespace ProyectoNoveno
{
    public partial class App : Application
    {
        public App ()
        {
            InitializeComponent();

            MainPage = new ProyectoNoveno.MainPage();
        }

        protected override void OnStart ()
        {
            // Handle when your app starts
        }

        protected override void OnSleep ()
        {
            // Handle when your app sleeps
        }

        protected override void OnResume ()
        {
            // Handle when your app resumes
        }
    }
}