title: Error:Failed to find: com.google.guava:guava:18.0.+
body: <p>I added this dependency to the gradle file</p>
  
  <p>// This is used by the Google HTTP client library.</p>
  
  <pre><code>compile(group: 'com.google.guava', name: 'guava', version: '18.0.+')
  </code></pre>
  
  <p>I tried syncing the Gradle file but it keeps giving me this error </p>
  
  <p>Error:Failed to find: com.google.guava:guava:18.0.+</p>