title: How to add firebase crashlytics into android projects
body: <p>In my application, I want to use <strong>firebase Crashlytics</strong> and for this, I added below codes into my application.<br>
  I added this codes step by step from google document!<br>
  I added below codes but when sync application show me an error and not sync project.<br></p>
  
  <p><strong>Build.gradle (project) :</strong> </p>
  
  <pre><code>buildscript {
      repositories {
          google()
          jcenter()
          maven { url 'https://maven.fabric.io/public' }
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.2.1'
          classpath 'com.google.gms:google-services:4.1.0'
          classpath 'io.fabric.tools:gradle:1.26.1'
      }
  }
  
  allprojects {
      repositories {
          google()
          jcenter()
          maven { url 'https://jitpack.io' }
          maven { url 'https://dl.bintray.com/tapsellorg/maven' }
          maven { url 'https://maven.google.com/' }
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p><strong>Build.gradle (app) :</strong> </p>
  
  <pre><code>dependencies {
      implementation 'com.google.android.gms:play-services-base:16.0.1'
      implementation 'com.google.firebase:firebase-core:16.0.6'
      implementation 'com.crashlytics.sdk.android:crashlytics:2.9.7'
  }
  apply plugin: 'com.google.gms.google-services'
  apply plugin: 'io.fabric'
  </code></pre>
  
  <p>but when added this line <code>apply plugin: 'com.google.gms.google-services'</code> , when click on sync show me below error : </p>
  
  <pre><code>The library com.google.android.gms:play-services-base is being requested by various other libraries at [[11.0.2,11.0.2]], but resolves to 16.0.1. Disable the plugin and check your dependencies tree using ./gradlew :app:dependencies.
  </code></pre>
  
  <p>How can I fix it?</p>