android intent filter?
===

I'm feeling stupid.This is very clear but I can not solve my problem.So excuse me for my question.      
My problem is in about intenfilter.This is application tag of my manifest file:      

    <application
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name" >
            <activity
                android:label="@string/app_name"
                android:name=".AlakyTestActivity" >
                <intent-filter >
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity
                android:label="reza"
                android:name="A2" >
                <intent-filter >
                    <action android:name="MAIN" />
    
                    <category android:name="LAUNCHER" />
                </intent-filter>
            </activity>
        </application>     
And this is my button click listener:       

    b1 = (Button)findViewById(R.id.button1);
            b1.setOnClickListener(new OnClickListener() {
    			
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				
    				Intent intent2 = new Intent();
    				intent2.setAction("MAIN");
    				intent2.addCategory("LAUNCHER");
    				startActivity(intent2);
    			}
    		});      
I think that all things is good but when I run my code and click on `b1`,I get this erroe:      

    android.content.ActivityNotFoundException: No Activity found to handle Intent { act=MAIN cat=[LAUNCHER] }      
Please help me.