title: Application is not supported in a Windows Presentation Foundation (WPF) project
body: <p>I've just created a new WPF project in the blend, pushed it on git, added mqsql drivers, rest service and nfc sdk and suddenly blend tells me that Application
   is not supported. The error leads me to App.xaml which is entirely unedited and looks like this:</p>
  
  <pre><code>&lt;Application x:Class="desktop_client.App"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:local="clr-namespace:desktop_client"
           StartupUri="MainWindow.xaml"&gt;
  &lt;Application.Resources&gt;
  
  &lt;/Application.Resources&gt;
  </code></pre>
  
  <p></p>
  
  <p>The same error goes for practically any tag such as Style, Setter, ControlTemplate, Canvas, Path. nothing is supported.
  comparing both the xaml and the c# file to the other project I just finished which works just fine, there is no difference (other than namespace and the path, naturally)</p>
  
  <p>I'm absolutely dumbfounded</p>