Generate Excel file with PhpSpreadsheet in Codeigniter from a view

I am trying to generate an Excel file with CodeIgniter and the PhpSpreadsheet library from a view. The report that I need to do is not a list but much more complex and I can generate them more quickly with a view and sending parameters. This is my code:

  $data = $this->model->traedatos();
  $vista = $this->load->view("datos_view", $data);
  $spreadsheet = new Spreadsheet();
  $writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet);
  $writer->save($vista);

And the following error is displayed

  

Severity: Warning

     

Message: fopen (): Filename can not be empty

     

Filename: Writer / Html.php

     

Line Number: 160

The PhpSpreadsheet documentation shows that an html page must be explicitly sent:

$writer->save("05featuredemo.htm");

Is there any way to do what I need?

Thanks for the help