title: Xcode 10: No setting for Valid Architectures
body: <p>I cannot find Valid Architectures settings under Project -> Build Settings -> Architectures. 
  <a href="https://i.stack.imgur.com/iOUVW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iOUVW.png" alt="enter image description here"></a>
  When I try to add VALID_ARCHS setting manually by clicking on + on top right, it gives an error </p>
  
  <blockquote>
    <p>There already is another setting named "VALID_ARCHS". Please enter a
    different name.</p>
  </blockquote>
  
  <p>But the setting is not visible.</p>
  
  <p>There is a problem creating an archive in Xcode 10 with an error</p>
  
  <blockquote>
    <p>'Abort Trap: 6' error in 'UICircularProgressRing'</p>
  </blockquote>
  
  <p>I am trying to follow the solution provided in this answer:
  <a href="https://stackoverflow.com/questions/52389664/xcode-10-not-being-able-to-archive-project">Xcode 10 not being able to archive project</a> but cannot find Valid Architectures Setting in Xcode 10.</p>