gradle - duplicate entry: com/google/android/gms/internal/zzaa.class after adding facebook sdk -

am getting error when trying generate release apk, after added facebook audience network sdk.

full error: execution failed task ':app:transformclasseswithjarmergingforrelease'. > com.android.build.api.transform.transformexception: java.util.zip.zipexception: duplicate entry: com/google/android/gms/internal/zzaa.class

here's gradle file:

buildscript {     repositories {         maven { url 'https://maven.fabric.io/public' }     }      dependencies {         classpath 'io.fabric.tools:gradle:1.+'     } } apply plugin: 'com.android.application' apply plugin: 'io.fabric'  android {     compilesdkversion 24     buildtoolsversion "23.0.2"      defaultconfig {         applicationid "com.coolcrazyapps.myapp"         minsdkversion 15         targetsdkversion 21         versioncode 10         versionname "2.0"         multidexenabled true     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  repositories {     mavencentral()     maven { url 'https://maven.fabric.io/public' } }  dependencies {     // support libraries     // misc libraries     compile filetree(dir: 'libs')     compile('com.crashlytics.sdk.android:crashlytics:2.5.2@aar') {         transitive = true;     }      compile 'com.android.support:appcompat-v7:24.0.0'     compile 'com.android.support:support-v13:24.0.0'     compile 'com.android.support:support-v4:24.0.0'     compile 'com.github.hotchemi:android-rate:0.4.1'     compile('com.google.firebase:firebase-core:9.2.1')     compile 'com.google.firebase:firebase-messaging:9.2.1'     compile 'io.branch.sdk.android:library:1.+'     compile 'com.android.support:design:24.0.0'     compile('com.facebook.android:audience-network-sdk:4.13.0') {         exclude group: 'com.google.firebase'     } }  apply plugin: 'com.google.gms.google-services' 

here's output of ./gradlew app:dependencies

_releaseapk - ## internal use, not manually configure ## +--- com.android.support:multidex:1.0.1 +--- com.crashlytics.sdk.android:crashlytics:2.5.2 |    +--- com.crashlytics.sdk.android:answers:1.3.2 |    |    \--- io.fabric.sdk.android:fabric:1.3.6 |    +--- io.fabric.sdk.android:fabric:1.3.6 |    +--- com.crashlytics.sdk.android:crashlytics-core:2.3.5 |    |    +--- com.crashlytics.sdk.android:answers:1.3.2 (*) |    |    \--- io.fabric.sdk.android:fabric:1.3.6 |    \--- com.crashlytics.sdk.android:beta:1.1.3 +--- com.android.support:appcompat-v7:24.0.0 |    +--- com.android.support:support-v4:24.0.0 |    |    \--- com.android.support:support-annotations:24.0.0 |    +--- com.android.support:support-vector-drawable:24.0.0 |    |    \--- com.android.support:support-v4:24.0.0 (*) |    \--- com.android.support:animated-vector-drawable:24.0.0 |         \--- com.android.support:support-vector-drawable:24.0.0 (*) +--- com.android.support:support-v13:24.0.0 |    \--- com.android.support:support-v4:24.0.0 (*) +--- com.android.support:support-v4:24.0.0 (*) +--- com.github.hotchemi:android-rate:0.4.1 +--- com.google.firebase:firebase-core:9.2.1 |    \--- com.google.firebase:firebase-analytics:9.2.1 |         +--- com.google.android.gms:play-services-basement:9.2.1 |         |    \--- com.android.support:support-v4:23.0.0 -> 24.0.0 (*) |         +--- com.google.firebase:firebase-common:9.2.1 |         |    +--- com.google.android.gms:play-services-basement:9.2.1 (*) |         |    \--- com.google.android.gms:play-services-tasks:9.2.1 |         |         \--- com.google.android.gms:play-services-basement:9.2.1 (*) |         \--- com.google.firebase:firebase-analytics-impl:9.2.1 |              +--- com.google.android.gms:play-services-basement:9.2.1 (*) |              +--- com.google.firebase:firebase-iid:9.2.1 |              |    +--- com.google.android.gms:play-services-basement:9.2.1 (*) |              |    \--- com.google.firebase:firebase-common:9.2.1 (*) |              \--- com.google.firebase:firebase-common:9.2.1 (*) +--- com.google.firebase:firebase-messaging:9.2.1 |    +--- com.google.android.gms:play-services-basement:9.2.1 (*) |    +--- com.google.firebase:firebase-iid:9.2.1 (*) |    \--- com.google.firebase:firebase-common:9.2.1 (*) +--- io.branch.sdk.android:library:1.+ -> 1.14.5 |    +--- com.android.support:support-annotations:22.2.0 -> 24.0.0 |    \--- io.branch.external.answersshim:answers-shim:0.0.4 +--- com.android.support:design:24.0.0 |    +--- com.android.support:support-v4:24.0.0 (*) |    +--- com.android.support:recyclerview-v7:24.0.0 |    |    +--- com.android.support:support-annotations:24.0.0 |    |    \--- com.android.support:support-v4:24.0.0 (*) |    \--- com.android.support:appcompat-v7:24.0.0 (*) \--- com.facebook.android:audience-network-sdk:4.13.0      +--- com.android.support:appcompat-v7:23.1.0 -> 24.0.0 (*)      +--- com.google.android.gms:play-services-ads:8.4.0      |    \--- com.google.android.gms:play-services-basement:8.4.0 -> 9.2.1 (*)      \--- com.android.support:recyclerview-v7:23.1.0 -> 24.0.0 (*) 

in android studio, see zzaa files @ these places:

let me know how resolve this, , what's causing trouble.

this solved problem:

compile ('com.facebook.android:audience-network-sdk:4.13.0'){      exclude group: 'com.google.android.gms'  }