title: java.util.zip.ZipException: duplicate entry:com/google/android/gms/auth/UserRecoverableAuthException.class
body: <p>I'm getting this issue after building app,</p>
  
  <p><strong>Execution failed for task ':appname:transformClassesWithJarMergingForDebug.
  com.android.build.api.transform.TransformException: 
  java.util.zip.ZipException: duplicate entry: com/google/android/gms/auth/UserRecoverableAuthException.class</strong></p>
  
  <p>My dependencies in build.gradle is </p>
  
  <pre><code>dependencies {
      compile fileTree(include: '*.jar', dir: 'libs')
      compile project(':_library')
      compile project(':android-support-v7-appcompat')
      compile project(':library_pull')
      compile project(':Drag_library')
      compile 'com.google.android.gms:play-services-appindexing:8.1.0'
      compile files('libs/org.apache.http.legacy.jar')
  }
  </code></pre>