title: Xcode 9.2 Upload to App Store fails with description length and invalid toolchain errors
body: <p>I've read through a bunch of forums including here:<br>
  <a href="https://forums.developer.apple.com/thread/87862" rel="noreferrer">https://forums.developer.apple.com/thread/87862</a><br>
  and some Stack Overflow posts.</p>
  
  <p>I have tried modifying my plist using the proposed solution of</p>
  
  <pre><code>find Products/ -name Info.plist -print0 | xargs -0n1 plutil -replace BuildMachineOSBuild -string 16A323
  </code></pre>
  
  <p>in the archive directory that I'm trying to load, and I'm still receiving the error below. I believe I have valid Xcode and Mac OS versions. I'm running Xcode 9.2 which was released today and High Sierra 10.13.1. Why does my upload fail with these errors and how can I fix it?</p>
  
  <p><a href="https://i.stack.imgur.com/5UwJ2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5UwJ2.png" alt="upload error messages"></a> </p>
  
  <p>The errors in text (to make this post more searchable):</p>
  
  <blockquote>
    <p>The following issues occurred while distributing your application.</p>
    
    <p>⚠ <strong>iTunes Store Operation Failed</strong><br>
     description length:2651858</p>
    
    <p>⚠ <strong>iTunes Store Operation Failed</strong><br>
     ERROR ITMS-90534: "Invalid Toolchain. New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, macOS, and iOS SDK or later. Don't submit apps built with beta software including beta macOS builds."</p>
  </blockquote>