مشکل در ساخت ActionBar توسط ActionBarSherlock

سلام
راستش اصلا نمیدونم مشکل از کجاست!!!
کدها و ارور رو میگذارم امیدوارم مشکل حل شه.

کلاس اصلی که اکشن بار باید در اون نمایش داده بشه:

import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;


public class ActivityMenu extends SherlockFragmentActivity {

    public ActionBar actionBar;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        actionBar = getSherlock().getActionBar();
        LayoutInflater li = LayoutInflater.from(this);
        View customView = li.inflate(R.layout.actionbar_custom, null);
        actionBar.setCustomView(customView);      //خط 23
    }
}

activity_menu.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="right" >

    <Button
        android:id="@+id/button1"
        android:layout_width="200dip"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Button" />

</RelativeLayout>

actionbar_custom.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="right" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_weight="1"
        android:background="#b53434"
        android:src="@drawable/menua" />

    <ImageButton
        android:id="@+id/item2"
        android:layout_width="100dip"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:background="#f000"
        android:src="@drawable/logo" />

    <ImageButton
        android:id="@+id/item1"
        android:layout_width="100dip"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:background="#f000"
        android:src="@drawable/logo" />

</RelativeLayout>

ارور:

FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{...packageName...ActivityMenu}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  at android.app.ActivityThread.access$600(ActivityThread.java:141)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:137)
  at android.app.ActivityThread.main(ActivityThread.java:5041)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:511)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
  at ....packageName....ActivityMenu.onCreate(ActivityMenu.java:23)
  at android.app.Activity.performCreate(Activity.java:5104)
  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  ... 11 more

ممنون