title: error: Unable to resolve build file: XCBCore.BuildFile
body: <pre><code>error: Unable to resolve build file: XCBCore.BuildFile (missingTargetProductReference("3bf83096e50de72a94699e9afc1133ebe3512682230d04680075c283a974e273")) (in target 'MyTarget')
  </code></pre>
  
  <p>Xcode 10 is giving this error immediately when trying to build our project. It's not immediately clear what is causing it. </p>
  
  <p>How can I resolve it?</p>