Error during Building an APK file in Android Studio 2.1.1

Question

Couple of days ago, I upgraded my Android Studio, and now I am facing a problem.

Actually I am trying to build an APK file from my project to test my app on a real device and when I click at Build--> Build Apk then I receive couple of errors in Message Gradle Build. I don't know why these errors are coming please elaborate on the reason as well.

Errors

1. Error:Error converting bytecode to dex:
   Cause: com.android.dex.DexException: Multiple dex files define Lcom/android/volley/VolleyError;

2. Error:Execution failed for task ':app:transformClassesWithDexForDebug'. com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_51\bin\java.exe'' finished with non-zero exit value 2

build.gradle file

 apply plugin: 'com.android.application'

android {
    signingConfigs {
    }

    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.dovezeal.gapp"
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7

    }

}



dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.0.1'
    //compile 'com.android.support:appcompat-v7:23.3.0'

    compile 'com.android.support:support-v4:23.3.0'
    compile 'com.android.support:design:23.0.1'
    compile 'com.android.support:design:23.1.1'

    // Volley
    compile 'com.android.volley:volley:1.0.0'
    //compile 'com.mcxiaoke.volley:library:1.0.+'
    /* compile files('libs/com.mcxiaoke.volley library-1.0.0.jar')*/


    // RecyclerView
    compile 'com.android.support:recyclerview-v7:23.0.+'

    // A simple way to define and render UI specs on top of your Android UI.
    compile 'org.lucasr.dspec:dspec:0.1.1'

    compile files('libs/library-1.0.0.jar')

    // YouTube Player
    compile files('libs/YouTubeAndroidPlayerApi.jar')

    // GOSN
   /* compile files('libs/gson-2.2.3.jar')*/




}

Edit - 1

As janki gadhiya said in her comment below, to change minifyEnabled true and try adding multiDexEnabled true under defaultConfig
with these changes both errors above are gone, but now this following error is coming up.

3. Error:Execution failed for task:app:transformClassesWithJarMergingForDebug' com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/android/volley/Request$Priority.class

Answer 1

build.gradle file

apply plugin: 'com.android.application'

android {
signingConfigs {
}

compileSdkVersion 23
buildToolsVersion "23.0.1"

defaultConfig {
    applicationId "com.dovezeal.gapp"
    minSdkVersion 19
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
    multiDexEnabled true
}

packagingOptions {
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/license.txt'
    exclude 'META-INF/notice.txt'
}
buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt')
    }
}

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7

}

}

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.0.1'
//compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:support-v4:23.3.0'
compile 'com.android.support:design:23.0.1'
compile 'com.android.support:design:23.1.1'

// as you already compiled gradle for volley here

compile 'com.android.volley:volley:1.0.0'

// RecyclerView
compile 'com.android.support:recyclerview-v7:23.0.+'
compile 'org.lucasr.dspec:dspec:0.1.1'

// you don't need this so comment the below line.
//compile files('libs/library-1.0.0.jar')

// YouTube Player
compile files('libs/YouTubeAndroidPlayerApi.jar')

}

Edit : Explanations

Your errors 1 - 2 : mean you are having more than 65,000 methods in your project, so I told you to set multiDexEnable true.

Your error 3 : means you're having more than one library having the implementation for the class Request$Priority.class, so the compiler is confused which to choose. So it is showing the error Duplicate entry. This will be solved by packaging options, this will let you use duplicate files.

Answer 2

Add this in your build gradle

    dexOptions {
            incremental true
            javaMaxHeapSize "4g"    
}



packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }

Answer 3

I am also getting the same error. When adding the compile 'com.google.firebase:firebase-ads:10.2.0' but it is removed when i do as follow:

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})

compile 'com.google.firebase:firebase-ads:10.2.0'
}

apply plugin: 'com.google.gms.google-services'**

and in BuildVarient use debugging mode.

I think it will help you.