Adding WindowsPhone8.1 project to Xamarin.Forms - xaml

As per Xamarin's Document I added the windows phone application to Xamarin.Forms project.
But, Step 5 is giving me error saying "Cannot create an instance of WindowsPhonePage".
<forms:WindowsPhonePage
xmlns:forms="using:Xamarin.Forms.Platform.WinRT"
x:Class="XamarinTest.WinPhone81.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamarinTest.WinPhone81"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
</forms:WindowsPhonePage>

OK, after a LOT of trial and error, I solved it. Guide didnt mention it, but I added Xamarin.Forms.Windows from NuGet and it solved the problem.

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error images:
Error Image 1
Error Image 2
please help me.
solution was by moving this file to another folder. (see image attached)
click to see error image screen
thank you #sambler

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Following steps worked for me:
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if your Region settings in the control panel mismatch the Windows Phone SDK's language (e.g. German), set the Format in the Region settings to English (United States)
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reopen Visual Studio and rebuild your project
I also faced this issue. the root cause for my problem is as below.
1) I referenced below in my code. but i haven't added the library( System.Xml.Serialization.xml). Add Reference and select System.Xml.Serialization.xml to include the dll.
System.Xml.Serialization
2) I use an usercontrol called FileList.xaml in the mainwindow
FileList.xaml
<AM:time2str x:Key="time2str"/>
But i didnt add the class which inherits from IMultiValueConverter
MainWindow.xaml.cs(I missed the following code)
public class time2str : IMultiValueConverter
{
public object Convert(object[] values, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
********************
}
public object[] ConvertBack(object value, System.Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new System.NotImplementedException();
}
}
In my case I had this error after downloading and installing a fresh Visual Studio 2012 (the initial release version) and trying to build the default blank Windows Phone template project straight out of the box - it was only resolved by updating Visual Studio 2012 Express to Update 5.
I had this message when the mobile project platform was "ARM", I changed to "any CPU".
Go to:
Solution Project / Properties
Configuration Properties / configuration
Click in mobile project / Platform / "Any CPU".
Clean the project and run again