title: The dependency `AFNetworking (~> 2.5)` is not used in any concrete target
body: <p>I want to install AFNetworking but I have a problem, how can I fix and install? I used <a href="https://github.com/AFNetworking/AFNetworking/wiki/Getting-Started-with-AFNetworking" rel="noreferrer">Getting Started with AFNetworking</a> :</p>
  
  <p>1. Download CocoaPods</p>
  
  <pre><code>sudo gem install cocoapods
  pod setup
  </code></pre>
  
  <p>2.a. Create a Podfile</p>
  
  <pre><code>touch Podfile
  open -a Xcode Podfile
  </code></pre>
  
  <p>2.b. And copy-paste this:</p>
  
  <pre><code>source 'https://github.com/CocoaPods/Specs.git'
  platform :ios, '7.0'
  pod 'AFNetworking', '~&gt; 2.5'
  </code></pre>