Change Activity via Options Menu

Hi All,

I'm really new to Android development, so I have one basic question.
I have the following code. I want to change the screen(the Activity) via Options menu:

Code (Text):

1.  
2.  
3. @Override
4.     public boolean onOptionsItemSelected(MenuItem item) {
5.         // TODO Auto-generated method stub
6.         switch (item.getItemId())
7.         {
8.         case R.id.item01:
9.             Intent intentItem1 = new Intent(this, Item1Activity.class);
10.             startActivityForResult(intentItem1, 0);
11.             //startActivity(intentItem1);
12.             return true;
13.            
14.         default: return super.onOptionsItemSelected(item);
15.         }
16.        
17.     }
18.  

But the activity doesn't change and the error message I receive while debugging is that "The resource doesn't exist"

Any ideas?

Thanks in advance.