Gradle issue, Converting Application from eclipse to studio

Question

Error :

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

com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/usr/lib/jvm/java-7-openjdk-amd64/bin/java'' finished with non-zero exit value 2

my gradle :

apply plugin: 'com.android.application'

android {
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/LGPL2.1'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/notice.txt'
    }
    compileSdkVersion 22
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.abcd"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile 'com.android.support:multidex:1.0.0'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.google.android.gms:play-services-ads:8.1.0'
    compile 'com.android.support:appcompat-v7:22.1.1'
    compile files('libs/bolts-android-1.1.4.jar')
    compile files('libs/bolts-android-1.1.4-javadoc.jar')
    compile files('libs/Parse-1.8.2.jar')
    compile files('libs/ParseCrashReporting-1.8.2.jar')
}

-- Whats wrong in above gradle.

-- I have also tried this gradle :

apply plugin: 'com.android.application'

android {
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/LGPL2.1'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/notice.txt'
    }
    compileSdkVersion 22
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.abcd"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile 'com.android.support:multidex:1.0.0'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.google.android.gms:play-services-ads:8.1.0'
    compile 'com.android.support:appcompat-v7:22.1.1'
    compile files('libs/bolts-android-1.1.4.jar')
    compile files('libs/Parse-1.8.2.jar')

}