title: Error "linker command failed with exit code 1 (use -v to see invocation)" for Simulator
body: <p>I am getting this error:</p>
  
  <pre><code>Apple Mach-O Linker Error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>When I set my testing device to the simulator. However, it does work on my iPhone.</p>
  
  <p>What is causing this?</p>