Android facebook登录时出现NoClassDefFoundError

我已将facebook sdk更新为4.0版，现在在尝试构建项目时出现以下错误：

java.lang.NoClassDefFoundError: com.facebook.LoggingBehavior[]
            at com.facebook.FacebookSdk.<clinit>(FacebookSdk.java:62)
            at pl.essentialapps.superplanner.LoginActivity.onCreate(LoginActivity.java:140)
            at android.app.Activity.performCreate(Activity.java:5372)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
            at android.app.ActivityThread.access$700(ActivityThread.java:159)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:176)
            at android.app.ActivityThread.main(ActivityThread.java:5419)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
            at dalvik.system.NativeStart.main(Native Method)

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我想你还没有初始化Facebook sdk。发布您的活动class@Soham我添加了oncreate方法，我认为这是最重要的部分OK。它在pl.essentialapps.superplanner.LoginActivity.onCreate（LoginActivity.java:140）处显示错误，该行中有什么？@Soham FacebookSdk.sdkinInitialize（getApplicationContext（））；好的，我无法找到根本原因，但你可以检查一下

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        if (isLogged()) {
            startActivityAfterLogin();
            finish();
        } else {
            FacebookSdk.sdkInitialize(getApplicationContext());
            callbackManager = CallbackManager.Factory.create();
            setContentView(R.layout.activity_login);
            mBtnFacebook = (LoginButton) findViewById(R.id.btnFacebook);
            mBtnFacebook.setReadPermissions(Arrays.asList("public_profile", "email"));

            setListeners();
            setFont();
            initStartAnimation();
        }
    }