$this->load->library('PHPExcel');
    $this->load->library('PHPExcel/IOFactory');

    $cache = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
    $cacheSettings = array( ' memoryCacheSize ' => '8MB');
    PHPExcel_Settings::setCacheStorageMethod($cache, $cacheSettings);

    $objReader = new PHPExcel_Reader_Excel2007();
    //$objReader->setReadDataOnly(true);
    $objPHPExcel = $objReader->load("./public/data/taxes.xls");
    $sheet = $objPHPExcel->getSheet(0);
    var_dump($sheet);

Fatal error: Uncaught exception 'PHPExcel_Exception' with message
   'Your requested sheet index: 0 is out of bounds.
    The actual number of sheets is 0.'