title: cocoapod ERROR tar: Unrecognized archive format
body: <p>i have try to install firebse in my project but i have receive this errors</p>
  
  <pre><code>[!] Error installing Firebase
  [!] /usr/bin/tar xfz /var/folders/t9/69xnfpsj4dd_gkst2lkt7_2c0000gn/T/d20170616-1202-vwchlz/file.tgz -C /var/folders/t9/69xnfpsj4dd_gkst2lkt7_2c0000gn/T/d20170616-1202-vwchlz
  
  tar: Unrecognized archive format
  tar: Error exit delayed from previous errors.
  </code></pre>
  
  <p>this below is my pod file :</p>
  
  <pre><code>platform :ios, '10.0'
  
  target 'weather' do
    use_frameworks!
    pod 'Kingfisher'
    pod 'Alamofire'
    pod 'Firebase'
  
  end
  </code></pre>
  
  <p>KingFisher and Alamofire install successfully but Firebase does not</p>