Cannot locate resource mainwindow.xaml WPF using MVVM

Question

Hello friends,

 

I m using this code and when i m running its threw me this exception please suggest me how to solve it .

 

Exception 

Cannot locate resource 'mainwindow.xaml'. 

 

My code 

<Window x:Class="TestMVVMApp.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="User Details" Height="448" Width="541">