Mon application se ferme quand je crée une instance de Firebase

java.lang.NoClassDefFoundError: com.firebase.client.Firebase 

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

/**


* Demonstrate Firebase Authentication using a Facebook access token.

*/
public class FacebookLoginActivity extends AppCompatActivity implements
        View.OnClickListener {

    private static final String TAG = "FacebookLogin";
    public ProgressDialog mProgressDialog;

    private TextView mStatusTextView;
    private TextView mDetailTextView;

    // [START declare_auth]
    private FirebaseAuth mAuth;
    // [END declare_auth]

    // [START declare_auth_listener]
    private FirebaseAuth.AuthStateListener mAuthListener;
    // [END declare_auth_listener]

    private CallbackManager mCallbackManager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_facebook);

        // Views
        mStatusTextView = (TextView) findViewById(R.id.status);
        mDetailTextView = (TextView) findViewById(R.id.detail);
        findViewById(R.id.button_facebook_signout).setOnClickListener(this);

        // [START initialize_auth]
        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();
        // [END initialize_auth]

        // [START auth_state_listener]
        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                }
                // [START_EXCLUDE]
                updateUI(user);
                // [END_EXCLUDE]
            }
        };
        // [END auth_state_listener]

        // [START initialize_fblogin]
        // Initialize Facebook Login button
        mCallbackManager = CallbackManager.Factory.create();
        LoginButton loginButton = (LoginButton) findViewById(R.id.button_facebook_login);
        loginButton.setReadPermissions("email", "public_profile");
        loginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d(TAG, "facebook:onSuccess:" + loginResult);
                handleFacebookAccessToken(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "facebook:onCancel");
                // [START_EXCLUDE]
                updateUI(null);
                // [END_EXCLUDE]
            }

            @Override
            public void onError(FacebookException error) {
                Log.d(TAG, "facebook:onError", error);
                // [START_EXCLUDE]
                updateUI(null);
                // [END_EXCLUDE]
            }
        });
        // [END initialize_fblogin]
    }

    // [START on_start_add_listener]
    @Override
    public void onStart() {
        super.onStart();
        mAuth.addAuthStateListener(mAuthListener);
    }
    // [END on_start_add_listener]

    // [START on_stop_remove_listener]
    @Override
    public void onStop() {
        super.onStop();
        if (mAuthListener != null) {
            mAuth.removeAuthStateListener(mAuthListener);
            hideProgressDialog();
        }
    }
    // [END on_stop_remove_listener]


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        mCallbackManager.onActivityResult(requestCode, resultCode, data);
    }

    // [START auth_with_facebook]
    private void handleFacebookAccessToken(AccessToken token) {
        Log.d(TAG, "handleFacebookAccessToken:" + token);
        // [START_EXCLUDE silent]
        showProgressDialog();
        // [END_EXCLUDE]

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(FacebookLoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }

                        // [START_EXCLUDE]
                        hideProgressDialog();
                        // [END_EXCLUDE]
                    }
                });
    }
    // [END auth_with_facebook]

    public void signOut() {
        mAuth.signOut();
        LoginManager.getInstance().logOut();

        updateUI(null);
    }

    private void updateUI(FirebaseUser user) {
        hideProgressDialog();
        if (user != null) {
            mStatusTextView.setText(getString(R.string.facebook_status_fmt, user.getDisplayName()));
            mDetailTextView.setText(getString(R.string.firebase_status_fmt, user.getUid()));

            findViewById(R.id.button_facebook_login).setVisibility(View.GONE);
            findViewById(R.id.button_facebook_signout).setVisibility(View.VISIBLE);
        } else {
            mStatusTextView.setText(R.string.signed_out);
            mDetailTextView.setText(null);

            findViewById(R.id.button_facebook_login).setVisibility(View.VISIBLE);
            findViewById(R.id.button_facebook_signout).setVisibility(View.GONE);
        }
    }

    @Override
    public void onClick(View v) {
        int i = v.getId();
        if (i == R.id.button_facebook_signout) {
            signOut();
        }
    }
    public void showProgressDialog() {
        if (mProgressDialog == null) {
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage(getString(R.string.loading));
            mProgressDialog.setIndeterminate(true);
        }

        mProgressDialog.show();
    }
    public void hideProgressDialog() {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.dismiss();
        }
    }

}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        mavenLocal()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.3'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven { url 'https://maven.fabric.io/public' }
        mavenLocal()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.2"

    defaultConfig {
        applicationId "com.arpacia.selfietime"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {

        // Build variant to include the Facebook Android SDk
        // The Facebook Android SDK has a min SDK version of 15
        facebook {
            minSdkVersion 15
        }

        // Build variant to exclude the Facebook Android SDK
        // Firebase Authentication has a min SDK version of 9
       // nofacebook {
           // minSdkVersion 9
       // }

    }
}
configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:24.0.0'
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.1.1'


    // Firebase Authentication
    compile 'com.google.firebase:firebase-auth:9.4.0'

    // Facebook Android SDK (only required for Facebook Login)
    // This is only compiled into the 'facebook' variant of this app. You can build
    // a 'nofacebook' variant to test on devices with SDK < 15.
    facebookCompile 'com.facebook.android:facebook-android-sdk:4.9.0'


    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'


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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="[http://schemas.android.com/apk/res/android]"
    package="com.arpacia.selfietime">

    <uses-permission android:name="android.permission.INTERNET"/>


    <application>
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        >
        <activity
            android:name=".FacebookLoginActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- Facebook Configuration -->
        <meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="115212333366322233" />
        <activity
            android:name="com.facebook.FacebookActivity"
            android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Translucent.NoTitleBar" />
    </application>

</manifest>

    private void signInWithFacebook(AccessToken token) {
        Log.d(TAG, "signInWithFacebook:" + token);

        showProgressDialog();


        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }else{
                            String uid=task.getResult().getUser().getUid();
                            String name=task.getResult().getUser().getDisplayName();
                            String email=task.getResult().getUser().getEmail();
                            String image=task.getResult().getUser().getPhotoUrl().toString();

                            //Create a new User and Save it in Firebase database
                            User user = new User(uid,name,null,email,null);

                            mRef.child(uid).setValue(user);

                            Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                            intent.putExtra("user_id",uid);
                            intent.putExtra("profile_picture",image);
                            startActivity(intent);
                            finish();
                        }

                        hideProgressDialog();
                    }
                });
    }