Estou criando um aplicativo para Android que consiste em gaveta de navegação no Android Studio. Estou recebendo um erro chamado tipos inconversíveis que não podem transmitir"Como resolver tipos inconversíveis não podem transmitir" Android.support.v4.app.fragment "para" packagename "" por favor me ajude a resolver isso. Esta é a minha activity_main.java

package sample.lakshman.com.sampleltester;

import android.content.Intent;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.Toolbar;
import sample.lakshman.com.sampleltester.Fragment_navigation;




public class MainActivity extends ActionBarActivity {
    public Toolbar toolbar;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = (Toolbar) findViewById(R.id.tool_bar);
        setSupportActionBar(toolbar);


        Fragment_navigation drawer_navigation = (Fragment_navigation)getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
        drawer_navigation.setUp((DrawerLayout)findViewById(R.id.drawer_layout),toolbar);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        if(id==R.id.navigation_item)
        {
            Intent sub = new Intent(MainActivity.this,Subactivity.class);
            startActivity(sub);
        }
        return super.onOptionsItemSelected(item);
    }
}

Este é o meu main_activity.xml

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/drawer_layout"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

        <include
            android:id="@+id/tool_bar"
            layout="@layout/tool_bar" />
    </RelativeLayout>
    <fragment
        android:id="@+id/fragment_navigation_drawer"
        android:layout_width="250dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:layout="@layout/fragment_fragment_navigation"
        android:name="sample.lakshman.com.sampleltester.Fragment_navigation"
        tools:layout="@layout/fragment_fragment_navigation" />

</android.support.v4.widget.DrawerLayout>