I am trying to create a tab layout . So,I am trying to inject an instance of FragmentManager to pass into the constructor of the ViewPagerAdapter. While doing this I'm getting this Error:

Error:(16, 10) error: android.app.FragmentManager cannot be provided without an @Provides- or @Produces-annotated method. android.app.FragmentManager is injected at example.XYZ.com.tabsdagger.MainActivity.fragmentManager example.XYZ.com.tabsdagger

AppModule:
@Module
public abstract class AppModule {
    @ContributesAndroidInjector(modules = MainActivityModule.class)
     abstract MainActivity mainActivity();
    @Provides
    @Singleton
    static Context getContext(Application application){
        return application.getApplicationContext();
    }

}

AppComponent:
@Singleton
@Component(modules = {MainActivityModule.class, AppModule.class})
public interface AppComponent {
    void inject(MainActivity mainActivity);

    @Component.Builder
    interface Builder {
        AppComponent build();

        @BindsInstance
        Builder buildapp(Application application);
        @BindsInstance
        Builder mainActivityBuilder(MainActivity mainActivity);
    }
}
MainActivityModule:
<pre>@Module
public abstract class MainActivityModule {

    @Provides
    static FragmentManager getFragmentManager(MainActivity mainActivity) {
        return mainActivity.getSupportFragmentManager();
    }
}

MyTabApplication:
public class MyTabApplication extends Application {
    @Inject
    MainActivity mainActivity;
    private static AppComponent appComponent;
    public static AppComponent getAppComponent(){
        return appComponent;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        appComponent=buildMyComponent();
    }

    private AppComponent buildMyComponent() {
        return DaggerAppComponent.builder().buildapp(this).mainActivityBuilder(new MainActivity()).build();
    }
}