I am getting this error please help me to solve

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'. > com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/api/client/http/AbstractInputStreamContent.class

//here is my gradle code

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.3"

defaultConfig {
    applicationId "com.richwebs.user.hohoride"
    minSdkVersion 15
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
    multiDexEnabled true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

packagingOptions{
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile('com.google.api-client:google-api-client-android:1.20.0') {
    exclude group: 'org.apache.httpcomponents'
}

compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.google.android.gms:play-services:9.0.2'
compile 'com.google.android.gms:play-services-base:9.0.2'
compile 'com.google.android.gms:play-services-analytics:9.0.2'
compile 'com.google.android.gms:play-services-maps:9.0.2'
compile 'com.mcxiaoke.volley:library-aar:1.0.0'
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:support-v4:23.4.0'
compile 'com.google.android.gms:play-services-ads:9.0.2'
compile 'com.google.android.gms:play-services-auth:9.0.2'
compile 'com.google.android.gms:play-services-gcm:9.0.2'
compile group: 'commons-io', name: 'commons-io', version: '2.0.1'

}
android {
useLibrary 'org.apache.http.legacy'
}