title: Android dependency com.google.firebase:firebase-core different version for the compile (12.0.1) and runtime (11.4.2)
body: <p>this is my Project Gradle dependencies </p>
  
  <pre><code>classpath 'com.android.tools.build:gradle:3.1.0'
  classpath 'com.google.gms:google-services:3.0.0'
  classpath "io.realm:realm-gradle-plugin:4.2.0"
  classpath 'com.google.firebase:firebase-plugins:1.1.1'
  </code></pre>
  
  <p>this is my App Gradle dependencies</p>
  
  <pre><code>implementation 'com.google.android.gms:play-services-ads:11.4.2'
  implementation 'com.google.firebase:firebase-core:11.4.2'
  implementation 'com.google.android.gms:play-services-base:11.4.2'
  implementation 'com.google.firebase:firebase-messaging:11.4.2'
  </code></pre>
  
  <p>Also i have change implementation to api ... the error still appears </p>