Prestashop PDF Download Error

Prestashop PDF Download Error

If you got error while downloading pdf file in Prestashop
Error : TCPDF ERROR: Some data has already been output to browser, can't send PDF file
First of all check the below line of code in classes/pdf/PDF.php in your Prestashop
ob_clean(); or ob_end_clean(); is there 
if ($render)
{
  if (ob_get_level() && ob_get_length() > 0) 
  {
  ob_clean();
  }
  return $this->pdf_renderer->render($this->filename, $display);
}
and try to Download pdf file.
If it's not working just add below highlighted line of code inside the constructor top in classes/pdf/PDF.php __constructor() function .
ob_start();
save file and download your pdf again.

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