title: Strange build error when using Objective-C framework file in Swift project (Empatica)
body: <p>I've been following <a href="http://developer.empatica.com/ios-sdk-tutorial-072.html" rel="nofollow noreferrer">this tutorial</a> to use the Empatica SDK framework (written in Objective-C) in my Swift project.</p>
  
  <p>Here's what I did:</p>
  
  <ol>
  <li>I dragged the Objective-C .framework file onto my Swift project</li>
  <li>I created the bridging file to use Objective-C in Swift</li>
  <li>Everything worked well (ie I was able to get Swift to detect Objective-C code); however, all of this work still resulted in the following build error that I cannot seem to understand:</li>
  </ol>
  
  <p><strong>EDIT:</strong>
  The "_OBJ_CASS" error is resolved, but now I'm only have the following error:</p>
  
  <pre><code>clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>