Commutator expressions must be constant expressions

I am using ActionBarSherlock and then onOptionsItemSelected

to start a new action when a specific menu item has been selected. The code worked correctly before adding the ABS and now I am getting the error case expressions must be constant expressions

on case

.

@Override
    public boolean onOptionsItemSelected(com.actionbarsherlock.view.MenuItem item) 
    {
        switch (item.getItemId()) {
        case R.id.about: //error
            startActivity(new Intent(this, AboutActivity.class));
            break;
        case R.id.feedback: //error
            //launch activity
            break;

        default:
            break;
        return super.onOptionsItemSelected(item);
    }

      

        
        
        
      

    

The same code worked great before adding ActionBarSherlock.