passing two parameters in index function using codeigniter -

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i want pass 2 parameters in index function using codeigniter giving me error don't know why giving me error. here controller

function index($one = null,$two = null) {     $data['title'] = "product page ";     $this->load->view('home/header/header',$data);     $this->load->view('home/css/css');     $this->load->view('home/navbar/navbar2');     $this->load->view('products/product');     $this->load->view('home/footer/footer');     $this->load->view('home/js/js'); }

here routes setting

$route['product/(:any)'] = 'product/index/$1';

when set index function in 1 parameter working fine not working 2 parameters.

you can try this, working 

$route['product/(.*)/(.*)']='product/index/$1/$2';

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