title: Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0)
body: <p>When I use <code>implementation 'com.google.firebase:firebase-inappmessaging-display:17.2.0'</code> in my <code>app/build.gradle</code>, I get this error:</p>
  
  <pre class="lang-none prettyprint-override"><code>Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0) and listenablefuture-1.0.jar (com.google.guava:listenablefuture:1.0)
  
  Go to the documentation to learn how to Fix dependency resolution errors.
  </code></pre>
  
  <p>What I also have in my <code>app/build.gradle</code> is this:</p>
  
  <pre><code>implementation 'com.google.android.gms:play-services-base:16.1.0'
  implementation 'com.google.android.gms:play-services-analytics:16.0.8'
  implementation 'com.google.android.gms:play-services-awareness:16.0.0'
  implementation 'com.google.android.gms:play-services-cast:16.2.0'
  implementation 'com.google.android.gms:play-services-gcm:16.1.0'
  implementation 'com.google.android.gms:play-services-location:16.0.0'
  implementation 'com.google.android.gms:play-services-maps:16.1.0'
  implementation 'com.google.firebase:firebase-core:16.0.8'
  implementation 'com.google.firebase:firebase-iid:17.1.2'
  implementation 'com.google.firebase:firebase-messaging:17.6.0'
  implementation 'android.arch.work:work-runtime:1.0.1'
  implementation 'com.android.support:multidex:1.0.3'
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>Maybe one of the libraries that I am using already includes support for the In-App Messaging dependency, and then it becomes redundant? Thank you.</p>