Execution failed for task app:transformClassesAndResourcesWithProguardForDebug

Question

when i try to run my app i get these errors:

Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForDebug'.

java.io.IOException: Please correct the above warnings first.

This is my Gradle file
apply plugin: 'com.android.application'

android {
compileSdkVersion 24
buildToolsVersion "24.0.2"

defaultConfig {
    applicationId "xxxxxxxxxxxxx"
    minSdkVersion 14
    targetSdkVersion 24
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled true
        shrinkResources true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
    debug {
        minifyEnabled true
        shrinkResources true
    }
}
}
repositories {
mavenCentral()
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'
compile 'com.google.android.gms:play-services:9.8.00'
compile 'com.google.android.gms:play-services-auth:9.8.00'
compile 'com.facebook.android:facebook-android-sdk:4.0.0'
compile 'com.google.android.gms:play-services-ads:9.8.00'
compile 'com.firebase:firebase-client-android:2.3.1'
compile 'com.google.android.gms:play-services-gcm:9.8.00'
}
apply plugin: 'com.google.gms.google-services'

can any one say why am i getting this error?

it shows some jar files are duplicate ,but i dont know which dependency to remove.

Answer 1

add the below to your ProGuard rules

-ignorewarnings