title: Xamarin Forms iOS Error: Metadata file '...' could not be found
body: <p>I recently updated my Xamarin version on my mac build server and Visual Studio on my windows machine. When I go to build the iOS project, I get an error:</p>
  
  <p>Metadata file '/Library/Frameworks/Xamarin.iOS.framework/Versions/Current/lib/mono/Xamarin.iOS/PhantomMqtt.Services.Implementation.dll' could not be found.</p>
  
  <p>That dll should be generated from another project in my solution.</p>
  
  <p>I have tried reinstalling Xamarin on my build server, but that has not helped.</p>
  
  <p>Thanks in advance!</p>