مشکل در رفتن به اکتیویتی دیگر

سلام یه برنامه splash screen رو گرفتم وتو مینش یه باتن گذاشتم که بره به اکتیویتی دیگه ولی خطای force close  میده

کد ها رو گذاشتم

//in splash screen

package p.h.a;

import p.h.a.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainMenu extends Activity {
 
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 
 Button b1=(Button) findViewById(R.id.button1);
 b1.setOnClickListener(new OnClickListener() {
 
 @Override
 public void onClick(View arg0) {
 Intent in=new Intent();
 in.setClass(MainMenu.this, Tutorialnumber.class);
 startActivity(in);
 }
 });
 Button b2=(Button) findViewById(R.id.button2);
 b2.setOnClickListener(new OnClickListener() {
 
 @Override
 public void onClick(View arg0) {
 // TODO Auto-generated method stub
 startActivity(new Intent(getApplicationContext(),Tutorialnumber.class));
 }
 });
 }
}

 //in main activity

package p.h.a;

import p.h.a.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainMenu extends Activity {
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button b1=(Button) findViewById(R.id.button1);
        b1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				Intent in=new Intent();
				in.setClass(MainMenu.this, Tutorialnumber.class);
				startActivity(in);
			}
		});
        Button b2=(Button) findViewById(R.id.button2);
        b2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				startActivity(new Intent(getApplicationContext(),Tutorialnumber.class));
			}
		});
    }
}

 //in manifest

<?xml version="1.0" encoding="utf-8"?>

<manifest 
    xmlns:android="http://schemas.android.com/apk/res/android"
      package="p.h.a"
      android:versionCode="1"
      android:versionName="1.0">
      
    <application 
        android:icon="@drawable/icon" 
        android:label="@string/app_name">
        
        <activity 
            android:name="p.h.a.SplashScreen"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity 
            android:name="p.h.a.MainMenu">
            <intent-filter>
                <action android:name="com.droidnova.android.splashscreen.MyApp" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity android:name="p.h.a.Tutorialnumber"></activity>
    </application>
    
    <uses-sdk android:minSdkVersion="4" />
    
</manifest>