title: Linker command failed with exit code 1 after installing CocoaPods and firebase pod
body: <p>I'm trying to use the firebase pod, however getting this (see image) error message when a run is attempted.  </p>
  
  <p>I followed <a href="https://stackoverflow.com/questions/14202255/pod-install-bash-pod-command-not-found">this guide</a> to install Cocoapods and added the firebase dependency to the Podfile.</p>
  
  <p>p.s I tried to clean it a bunch of times. </p>
  
  <p><a href="https://i.stack.imgur.com/HQw6Z.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HQw6Z.png" alt="enter image description here"></a></p>