title: Unable to install Firestore
body: <p>I'm getting the following error when trying to add Firestore pod to <strong>already existing project</strong>:</p>
  
  <blockquote>
    <p>[!] Unable to satisfy the following requirements:<br>
    -<code>Firebase/FireStore</code> required by <code>Podfile</code></p>
  </blockquote>
  
  <p>My podfile is looking like this:</p>
  
  <pre><code>platform :ios, '10.3'
  target 'ledosMain' do
    use_frameworks!
    target 'ledosMainTests' do
      inherit! :search_paths
      pod 'Firebase/Auth'
      pod 'Firebase/Storage'
      pod 'Firebase/Core'
      pod 'Firebase/DynamicLinks'
      pod 'FirebaseUI/Auth'
      pod 'Firebase/FireStore'
    end
    target 'ledosMainUITests' do
      inherit! :search_paths
    end
  end
  </code></pre>
  
  <p>I've tried pod repo update, pod install, pod update but I'm still getting this error. What can I do to fix it?</p>