My WPF Application cannot locate resource 'Mainwindow.xaml'

I have been working on a WPF application using vb.net and I've recently run into a problem. When I build my code, the build is successful but when it comes to running the code the System.IO.IOexception throws an exception "Cannot locate resource ViewModel/ViewModel/Mainwindow.xaml" The .Xaml windows are located in a folder called ViewModel hence I don't know where the other ViewModel/ViewModel... path is coming from, isn't it supposed to be viewModel/MainWindow.Xaml? I have tried all possible solutions including cleaning up the Project but it doesn't seem to work. The only solution that seems to work is if I change the StartupUri from `StartupUri = "ViewModel\MainWindow.Xaml"` TO `StartupUri = "...\MainWindow.xaml"` but I doubt if that is the right thing to do.