Absturz bei Tablayout

public class TabLayoutActivity extends TabActivity {
    /** Called when the activity is first created. */
	private SharedPreferences preferences;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {    	    	
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    
    @Override
    public void onResume() {
    	//Toast.makeText(this.getBaseContext(), "test", Toast.LENGTH_LONG).show();
        this.preferences =  SettingsActivity.getPreferences(this);
        
        Resources res = getResources(); // Resource object to get Drawables
        TabHost tabHost = getTabHost();  // The activity TabHost       
        TabHost.TabSpec spec;  // Resusable TabSpec for each tab
        Intent intent;  // Reusable Intent for each tab

        
        tabHost.clearAllTabs();
        
        // Create an Intent to launch an Activity for the tab (to be reused)
        intent = new Intent().setClass(this, FavoritesActivity.class);

        // Initialize a TabSpec for each tab and add it to the TabHost
        spec = tabHost.newTabSpec("Favorites").setIndicator(this.getString(R.string.favorites),
                          res.getDrawable(R.drawable.ic_tab_favorites)).setContent(intent);
        tabHost.addTab(spec); // <------ Zeile 44: Hier knallts
        
        // Do the same for the other tabs
        intent = new Intent().setClass(this, OptionalActivity.class);
        spec = tabHost.newTabSpec("Optional").setIndicator(this.getString(R.string.optional),
                res.getDrawable(R.drawable.ic_tab_optional)).setContent(intent);
        tabHost.addTab(spec);
        
        //Display the hidden apps only if activated in settings
        if (this.preferences.getBoolean("display_hidden_apps", true)) {
	        intent = new Intent().setClass(this, HiddenActivity.class);
	        spec = tabHost.newTabSpec("hidden").setIndicator(this.getString(R.string.hidden),
	                          res.getDrawable(R.drawable.ic_tab_hidden)).setContent(intent);
	        tabHost.addTab(spec);
        }

        //Setting the start tab
        tabHost.setCurrentTab(0);
    	
    	super.onResume();
    }
    
    public boolean onCreateOptionsMenu(android.view.Menu menu) {
    	getMenuInflater().inflate(R.menu.tab_layout_menu, menu);
    	return super.onCreateOptionsMenu(menu);
    }      
    
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.settings:
			Intent intent = new Intent(this, SettingsActivity.class);
			startActivity(intent);
			return true;
		default:
			return super.onOptionsItemSelected(item);
			
		}
	}        
}

public class FavoritesActivity extends ListActivity {
	private FlatNavigation navigation;	
	
    /** Called when the activity is first created. */
    @Override    
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
    }
    

    @Override
    public void onResume(){
    	
    	this.navigation = NavigationConfigurator.initializeNavigation();   	
    	setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, this.navigation.getNavCollection(ViewType.FAVORITE).getSubAppsNames()));

        ListView lv = getListView();
        lv.setTextFilterEnabled(true);

        AppSelectedListener listener = new AppSelectedListener(this, navigation);                
        lv.setOnItemClickListener(listener);
    	super.onResume();
    } 
}

public class SubAppDummyActivitiy extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dummy);
        
        TextView textview = new TextView(this);
        textview.setText("Dummy");
        setContentView(textview);        
    }
}