Android : setOnItemSelectedListener make my app Crach

Hi am tring to use the Spinner Item to Select a user name then open a new concersation layout when the client click start chat Button .. i am sure that Button code is correct but my Spinner code is not going well it make my application crash ...

myListView.setOnItemSelectedListener(new OnItemSelectedListener (){

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, 
                int pos, long id) {

            // An item was selected. You can retrieve the selected item using


             name1=parent.getItemAtPosition(pos).toString();    
             CStart = (Button) findViewById(R.id.Start) ;
              CStart.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        open(v);
                        }
                    }
                  );
        }
        public void onNothingSelected(AdapterView<?> parent) {
            // Another interface callback

        }
      });

and this is the open(v) methode code :

protected void open(View v) {
// TODO Auto-generated method stub
   Intent i = new Intent(this ,MainActivity2.class);
   i.putExtra("message",name1);
    startActivityForResult(i, 1);

}

so can you help me to fix my code????