title: Program type already present: android.support.v4.media.MediaBrowserCompat$CustomActionCallback
body: <p>I completely new to Android Development and can't seem to resolve this error: 
  <em>"Error: Program type already present: android.support.v4.media.MediaBrowserCompat$CustomActionCallback"</em></p>
  
  <p>This is my dependencies:</p>
  
  <pre><code>dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
  implementation 'androidx.appcompat:appcompat:1.0.0-alpha1'
  implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
  implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0-alpha1'
  implementation 'androidx.legacy:legacy-support-v4:1.0.0-alpha1'
  implementation "android.arch.navigation:navigation-fragment:1.0.0-alpha01"
  implementation "android.arch.navigation:navigation-ui:1.0.0-alpha01"
  
  
  androidTestImplementation 'androidx.test:runner:1.1.0-alpha3'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha3'
  testImplementation 'junit:junit:4.12'
  }
  </code></pre>
  
  <p>I've googled some and ended up on the developer page about "Resolve duplicate class errors", but I'm still not able to fix this. Help would be very much appriciated!</p>