Exception: Request failed for https://docs.google.com returned code 400 - google-apps-script

Question

My response is :
Exception: Request failed for https://docs.google.com returned code 400. Truncated server response: <meta nam... (use muteHttpExceptions option to examine full response)
could anyone help me please ? Thank you ! (i'm french... sorry ;)
My code is :
function emailSpreadsheetAsPDF() {
DocumentApp.getActiveDocument();
DriveApp.getFiles();
// This is the link to my spreadsheet with the Form responses and the Notification of Absence Template sheet
// Add the link to your spreadsheet here
// or you can just replace the text in the link between "d/" and "/edit"
// In my case is the text: 1Kj4U5hrIPiRAjceHkySUlLFXjckh75R-KVqn0IsNrjA
const ss = SpreadsheetApp.openByUrl("https://docs.google.com/spreadsheets/d/1ktAc1lf1lhQ9xf04sRm18l-8GQurW4eqnqrldbBNYj8/edit");
// We are going to get the email address from the cell "A1" from the "Notification of Absence" sheet
// Change the reference of the cell or the name of the sheet if it is different
const value = ss.getSheetByName("NOA PDF").getRange("a1").getValue();
const email = value.toString();
// Subject of the email message
const subject = 'Notification of Absence Form';
// Email Text.
const body = "Hello Cerian, <br/> <br/> Please find attached a Notification of Absence Form. <br/> This has also been automatically saved to the Sickness folder, but will need to be sorted into the correct employee's file. <br/> <br/> Sickness Folder - https://drive.google.com/drive/folders/1SCPGzH4fz7ryna7SSuXSTtYbJlJ52r0U?usp=sharing.";
// Again, the URL to your spreadsheet but now with "/export" at the end
// Change it to the link of your spreadsheet, but leave the "/export"
const url = 'https://docs.google.com/spreadsheets/d/1ktAc1lf1lhQ9xf04sRm18l-8GQurW4eqnqrldbBNYj8/export?';
const exportOptions =
'exportFormat=pdf&format=pdf' + // export as pdf
'&size=a4' + // paper size letter / You can use A4 or legal
'&portrait=true' + // orientation portal, use false for landscape
'&fitw=true' + // fit to page width false, to get the actual size
'&sheetnames=false&printtitle=false' + // hide optional headers and footers
'&pagenumbers=false&gridlines=false' + // hide page numbers and gridlines
'&fzr=false' + // do not repeat row headers (frozen rows) on each page
'&gid=852132144'; // the sheet's Id. Change it to your sheet ID.
// You can find the sheet ID in the link bar.
// Select the sheet that you want to print and check the link,
// the gid number of the sheet is on the end of your link.
var params = {method:"GET",headers:{"authorization":"Bearer "+ ScriptApp.getOAuthToken()}};
// Generate the PDF file
var response = UrlFetchApp.fetch(url+exportOptions, params).getBlob();
// Send the PDF file as an attachement
GmailApp.sendEmail(email, subject, body, {
htmlBody: body,
attachments: [{
fileName: "Notification of Absence Form" + ".pdf",
content: response.getBytes(),
mimeType: "application/pdf"
}]
});
// Save the PDF to Drive. The name of the PDF is going to be the name of the employee (cell b9)
const nameFile = ss.getSheetByName("NoA PDF").getRange("b9").getValue().toString() +".pdf"
DriveApp.createFile(response.setName(nameFile));
var files = DriveApp.getRootFolder().getFiles();
while (files.hasNext()) {
var file = files.next();
var destination = DriveApp.getFolderById("1SCPGzH4fz7ryna7SSuXSTtYbJlJ52r0U");
destination.addFile(file);
var pull = DriveApp.getRootFolder();
pull.removeFile(file);
}
}