How to read xls file in laravel - laravel-excel

I'm using laravel-excel library to read excel files.

http://www.maatwebsite.nl/laravel-excel/docs/import

   //http://localhost:8000/assets/panel/excel/test123.xls
    $address = URL::to('/assets/panel/excel/').'/test123.xls';
   // dd($address);
    Excel::load($address, function($reader) {

        $results = $reader->get();
        dd($results);

    });

this file http://localhost:8000/assets/panel/excel/test123.xls exist but I got this error:

Could not open C:\xampp\htdocs\tahrircenter\http://localhost:8000/assets/panel/excel/test123.xls for reading! File does not exist.

I know the meaning of the error, but how can I use my address instead of directory address in this library?