title: Unable to build using Xcode 4 - The selected run destination is not valid for this action
body: <p>So I'm horribly confused by this error, other threads on Stack Overflow mention I should set the SDK, but I see no option to do this.  I'm trying to build:<a href="http://wafflesoftware.net/shortcut/" rel="noreferrer">http://wafflesoftware.net/shortcut/</a></p>
  
  <p>And I get no options, and I can only choose My Mac 64-bit, and I want it in 32-bit.  Really beginning to hate Xcode 4.</p>
  
  <p>Here is the screenshot when I try to edit my scheme: <a href="http://groovyape.com/scheme.png" rel="noreferrer">http://groovyape.com/scheme.png</a></p>
  
  <p>Thoughts?</p>