java.lang.NoClassDefFoundError: Failed resolution Failed resolution of: Lcom/google/android/gms/common/internal/zzab;
<p>I am following a tutorial (<a href="http://android2.in/how-to-upload-images-to-firebase-storage/" rel="noreferrer">link</a>) to upload images to Firebase database but am getting the below error. I rechecked the gradle dependencies and also enabled  multidex support but error still remains</p>

<pre><code>java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/internal/zzab;
    at com.google.firebase.storage.FirebaseStorage.getInstance(Unknown Source)
    at com.paperwrrk.android.storageref.MainActivity.&lt;init&gt;(MainActivity.java:36)
    at java.lang.Class.newInstance(Native Method)
    at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2351)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5461)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102)
    Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.internal.zzab" on path: DexPathList[[dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-tubesock-0.0.11_74622aa9da17bf60443b34c100000d076f6631ba-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-support-annotations-25.0.0_416ca7aea2b0e15fba678c97c0d71c330758ffee-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-jackson-databind-2.2.2_169f7b55dddecf9b169deccb0ac50ee124eda962-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-jackson-core-2.2.2_3ae6e87b0280ab52f712dfb927e3401fe25aa21c-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-jackson-annotations-2.2.2_dd21f43a23482b41eb5ed094fcce68c90eeb0ffd-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-internal_impl-25.0.0_e8156948d2eb9e5ed0b41cc1f9f830e7838bb3b5-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-internal_impl-25.0.0_9056040795c4cf170b00cbf021bf976514542498-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-internal_impl-25.0.0_79b2045e82b81d2f064515f884990a3d2a9f29af-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-internal_impl-25.0.0_2879b3ac18601405060244958a8db64bdb3655f9-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-internal_impl-25.0.0_1ce40cec84eadc9153f026cb869c8b1760c8461a-classes.dex", dex file "/data/data/com.paperwrrk.android.storageref/files/instant-run/dex/slice-firebase-client-jvm-2.3.1_764f8006
</code></pre>

<p>Gradle.app</p>

<pre><code>apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "24.0.3"
    defaultConfig {
        applicationId "com.paperwrrk.android.storageref"
        minSdkVersion 18
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE-FIREBASE.txt'
        exclude 'META-INF/NOTICE'
    }
}

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.android.support:appcompat-v7:25.0.0'
    compile 'com.google.firebase:firebase-database:10.0.0'
    testCompile 'junit:junit:4.12'
    compile 'com.firebase:firebase-client-android:2.3.1'
    compile 'com.google.firebase:firebase-auth:9.2.1'
    compile 'com.google.firebase:firebase-storage:9.2.1'
    compile 'com.android.support:multidex:1.0.0'
}


apply plugin: 'com.google.gms.google-services'
</code></pre>

<p>Please tell what I'm doing wrong here!</p>