title: Visual Studio 2017 froze while installing Nuget package and now my Xamarin project doesn't load
body: <p>I tried to install Xamarin.Android.Support.Annotations 28.0.0 only to the Android part of my Xamarin Forms project. </p>
  
  <p>There's a popup with:</p>
  
  <pre><code>Microsoft Visual Studio is busy
  We'll automatically report this delay to Microsoft...
  </code></pre>
  
  <p>No matter how long I wait, I can't open the project. What do I have to do to clear the cache to be able to load my project again?</p>