title: IInAppBillingService Program type already present
body: <p>I just updated my CompileSDKVersion and TargetSDK Version to 27, and updated the dependencies accordingly, and now my app won't run, it's getting this error:</p>
  
  <pre><code>Program type already present: com.android.vending.billing.IInAppBillingService
  Message{kind=ERROR, text=Program type already present: com.android.vending.billing.IInAppBillingService, sources=[Unknown source file], tool name=Optional.of(D8)}
  </code></pre>
  
  <p>I'm using a billing library called <a href="https://github.com/serso/android-checkout" rel="nofollow noreferrer" title="checkout">checkout</a>.   I've tried reverting back to 26 and disabling certain dependencies but nothing seems to work.</p>
  
  <p><strong>My App Level Build.Gradle</strong></p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'io.fabric'
  
  android {
      compileSdkVersion 27
      buildToolsVersion '27.0.3'
      defaultConfig {
          applicationId "me.paxana.cwnet"
          minSdkVersion 16
          targetSdkVersion 27
          versionCode 9
          versionName "2.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
          multiDexEnabled true
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation 'com.google.android.gms:play-services-ads:15.0.0'
      implementation 'com.google.firebase:firebase-messaging:15.0.0'
      implementation fileTree(include: ['*.jar'], dir: 'libs')
      androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
      implementation 'com.android.support:appcompat-v7:27.1.1'
      implementation 'com.android.support:gridlayout-v7:27.1.1'
      implementation 'com.android.support:recyclerview-v7:27.1.1'
      implementation 'com.android.support:design:27.1.1'
      implementation 'com.android.support:support-v4:27.1.1'
      implementation 'com.android.support:support-media-compat:27.1.1'
      implementation 'com.android.support:customtabs:27.1.1'
      implementation 'com.android.support:animated-vector-drawable:27.1.1'
      implementation 'com.android.support:cardview-v7:27.1.1'
      implementation 'com.android.support.constraint:constraint-layout:1.0.2'
  
      implementation 'com.squareup.okhttp3:okhttp:3.9.0'
      implementation 'com.squareup.picasso:picasso:2.5.2'
  
      implementation 'com.google.firebase:firebase-core:15.0.0'
      implementation 'com.google.firebase:firebase-auth:15.0.0'
      implementation 'com.google.firebase:firebase-database:15.0.0'
      implementation 'com.google.firebase:firebase-ads:15.0.0'
      implementation 'com.google.firebase:firebase-crash:15.0.0'
      implementation 'com.firebaseui:firebase-ui-auth:3.3.0'
      implementation 'com.firebaseui:firebase-ui-database:3.0.0'
  
      implementation 'org.solovyev.android:checkout:1.2.1'
  
      implementation 'com.google.android.gms:play-services-auth:15.0.0'
      implementation 'com.facebook.android:facebook-android-sdk:4.29.0'
      implementation 'com.nineoldandroids:library:2.4.0'
      implementation 'com.daimajia.slider:library:1.1.5@aar'
      implementation 'me.zhanghai.android.materialratingbar:library:1.2.0'
      implementation 'com.squareup.moshi:moshi:1.5.0'
      implementation('com.crashlytics.sdk.android:crashlytics:2.7.1@aar') {
          transitive = true
      }
      implementation 'com.anthonymandra:ToggleButtons:2.0.0'
      annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
      implementation 'com.jakewharton:butterknife:8.8.1'
      implementation 'com.mikepenz:iconics-core:3.0.3@aar'
      implementation 'com.mikepenz:fontawesome-typeface:5.0.6.0@aar'
      implementation 'com.anjlab.android.iab.v3:library:1.0.44'
  
      testImplementation 'junit:junit:4.12'
   }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p><strong>my project level build.gradle</strong></p>
  
  <pre><code>    // Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      repositories {
          jcenter()
          mavenCentral()
          google()
          maven {
              url 'https://maven.fabric.io/public'
          }
          maven { url 'https://repo.spring.io/plugins-snapshot' }
  
  
          maven {
              url 'https://maven.google.com/'
              name 'Google'
          }
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.1.1'
          classpath 'com.google.gms:google-services:3.2.1'
          classpath 'io.fabric.tools:gradle:1.24.4'
          classpath 'io.spring.gradle:dependency-management-plugin:1.0.6.BUILD-SNAPSHOT'
  
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          maven { url "https://jitpack.io" }
          jcenter()
          maven {
              url "https://maven.google.com" // Google's Maven repository
          }
          google()
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>