title: Xamarin "XamarinShellPackage" did not load correctly
body: <p>I have hit a problem with the new free version of Xamarin.</p>
  
  <p>What I was finding is that I could not use the Storyboard. Whenever I tried to look at Main.storyboard I got the following error message:</p>
  
  <blockquote>
    <p>Something went wrong - The iOS Designer Mac Agent is not available</p>
  </blockquote>
  
  <p>And when I clicked “Start Designer Agent” on that same dialog it went away for a few seconds with a progress bar and then came back with the exact same error.</p>
  
  <p>This was odd because I could run the project I have created and it ran fine on the emulator on the connected Mac so I was definitely connected to it. I could also debug the code fine as well. But I couldn’t edit the UI or the storyboard at all.</p>
  
  <p>I contacted the Xamarin support email address and told them all of this and they suggested to update the various components thusly:</p>
  
  <blockquote>
    <p>To update Xamarin on the Mac open Xamarin Studio and click on:</p>
    
    <p>Xamarin Studio > Check for Updates...</p>
    
    <p>I would advise doing the same for Xamarin for Visual Studio:</p>
    
    <p>Visual Studio > Tools > Options > Xamarin > Other > Check for
    Updates...</p>
    
    <p>Please also ensure that Xcode is up to date and that you've launched
    Xcode and accepted any agreements for any new version.</p>
  </blockquote>
  
  <p>So I followed those instructions.</p>
  
  <p>I checked on the Mac and the Xamarin Studio installation is up to date. I checked the Xcode on the Mac and it is the latest version. I went to do the update in Visual Studio for Xamarin and some things were out of date so I went through that update. I also rebooted afterwards and restarted Visual Studio.</p>
  
  <p>Unfortunately it has made the problem much worse.</p>
  
  <p>Previously I could at least open and run projects using Xamarin in Visual Studio 2015. What I was unable to do was use the storyboard designer.</p>
  
  <p>Now I cannot do anything with Xamarin as now when I try to run Visual Studio with a Xamarin project I get the following dialog several times:</p>
  
  <blockquote>
    <p>The XamarinShellPackage package did not load correctly.</p>
  </blockquote>
  
  <p>As well as another similar dialog referring to “XamarinAndroidPackage” and now the solution in the solution explorer is unavailable for Xamarin projects and I cannot create a new one without getting these messages.</p>
  
  <p>I have tried reinstalling Visual Studio 2015 but that has not helped.</p>
  
  <p>I have tried escalating this problem with Xamarin but the best they could suggest is posting here on Stack Overflow as the best way of getting support for this. Any suggestions? </p>