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I am following a tutorial (link) 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

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.<init>(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

Gradle.app

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'

Please tell what I'm doing wrong here!

now here is the problem, you are using different versions in dependencies of gradle
So change this

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'

to this

compile 'com.google.firebase:firebase-database:10.0.1'

testCompile 'junit:junit:4.12'

compile 'com.firebase:firebase-client-android:2.3.1'

compile 'com.google.firebase:firebase-auth:10.0.1'

compile 'com.google.firebase:firebase-storage:10.0.1'

compile 'com.android.support:multidex:1.0.0'

one more thing is that now com.firebae:firebase-client-android is deprecated so you need to replace it with com.google.firebase:firebase-database:10.0.1 and here is the documentation for that https://firebase.google.com/support/guides/firebase-android

If you are seeking solution for react-native project, make sure there is same version used among different modules and replace "+" with some latest available version.

try adding like this in the project bundle.gradle file

allprojects {

    repositories {

    //start here

    configurations.all {

 resolutionStrategy.eachDependency { DependencyResolveDetails details ->

   def requested = details.requested

       if (requested.group == 'com.google.android.gms') {

          details.useVersion '12.0.1'

       }

       if (requested.group == 'com.google.firebase') {

          details.useVersion '12.0.1'

         }

       }

     }

    //end

     jcenter()

       maven {

         url "https://maven.google.com"

       }

     }

 }

add the following dependencices to Module/bundle.gradle

implementation 'com.google.firebase:firebase-core:16.0.1'

implementation 'com.firebaseui:firebase-ui-auth:3.3.0'