隐式调用intent报错，找不到原因，请指点，谢谢

第一个MainActivity 源码

public class MainActivity extends Activity {

public final static String MY_ACTION = "com.zkbao.intentactioncategorytest.action.MY_ACTION";
public final static String MY_CATEGORY="com.zkbao.intentactioncategorytest.category.MY_CATEGORY";
private Button startBtn = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startBtn = (Button)findViewById(R.id.startBtn);

startBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(); //隐式调用，传递自定义的Action和category
intent.setAction(MainActivity.MY_ACTION);
intent.addCategory(MainActivity.MY_CATEGORY);

startActivity(intent);
}
});
}

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

}

第二个SecondActivity源码

public class SecondActivity extends Activity {

private TextView actionShowText=null;
private TextView categoryShow=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);

actionShowText = (TextView)findViewById(R.id.actionShow);
categoryShow = (TextView)findViewById(R.id.categoryShow);

actionShowText.setText("action is: "+getIntent().getAction());
Set<String> cate = getIntent().getCategories();
categoryShow.setText("category is: "+cate);
}

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

}

mainfest配置部分
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.zkbao.intentactioncategorytest.MainActivity"
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="com.zkbao.intentactioncategorytest.SecondActivity"
android:label="@string/title_activity_second" >
<intent-filter>
<action android:name="com.zkbao.intentactioncategorytest.action.MY_ACTION"/>
<category android:name="android.intent.category.DEFAULT" />
<category android:name="com.zkbao.intentactioncategorytest.category.My_CATEGORY"/>

</intent-filter>
</activity>
</application>

可是运行程序，一点MainActivity按钮，报错：


看了很多网上都说是配置文件配置有问题，一般都是少了<category android:name="android.intent.category.DEFAULT" />，可是我已经加上了，还是出错，请指点，谢谢