So like as title mentioned, I want to generate PDF from google sheet. I found this reference.

and the following is my code:

function saveSheetsEachPDF(sheet){
  let ss = sheet.getParent()
  let ss_ID = ss.getId();
  let sheet_ID = sheet.getSheetId();
  let file_name = '生產單-'+sheet.getName();
  const url_base = 'https://docs.google.com/spreadsheets/d/'+ss_ID;
  const url_ext = 'export?format=pdf'
      + '&size=A4'
      + '&portrait=true'
      + '&fitw=true'
      + '&sheetnames=false&printtitle=false&pagenumbers=false'
      + '&gridlines=false'
      + '&fzr=false'
      + 'gid=' + sheet_ID
  let options = {method:"GET", headers: {"authorization":"Bearer"+ScriptApp.getOAuthToken()}};
  let response = UrlFetchApp.fetch(url_base+url_ext, options);
  let blob = response.getBlob().setName(file_name+'.pdf') 
  const folder = DriveApp.getFoldersByName("生產單PDF").next();
  folder.createFile(blob);

}

However I get this error that I have no clue what it means :

Exception: Request failed for https://docs.google.com returned code 404. Truncated server response: <meta name=”viewport” c… (use muteHttpExceptions option to examine full response)