问google sheets to zip using apps script

EN

var blobs = [];

function myFunction(){
   var file = DriveApp.getFileById("fileId");
   var blobObject = file.getBlob();
   var blobObject1 = file.getBlob().setContentType("application/vnd.google-apps.spreadsheet").setName("blob1.xlsx");
   var blobObject2 = file.getBlob().setContentType('application/vnd.ms-excel').setName("blob2.xlsx");
   var blobObject3 = file.getBlob().setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet").setName("blob3.xlsx");

   blobs.push(blobObject)
   blobs.push(blobObject1)
   blobs.push(blobObject2)
   blobs.push(blobObject3)

   Logger.log(file.getMimeType());    // output : application/vnd.google-apps.spreadsheet
   Logger.log(blobObject.getContentType())   // output : application/pdf

   Logger.log(blobObject1.getContentType()) // output : application/vnd.google-apps.spreadsheet
   Logger.log(blobObject2.getContentType()) // output : application/vnd.ms-excel
   Logger.log(blobObject3.getContentType()) // output : application/vnd.openxmlformats-officedocument.spreadsheetml.sheet


   var timestamp = new Date().toISOString().split("T")[0];
   var zip = Utilities.zip(blobs, "FolderName"+timestamp+".zip");
   var folder = DriveApp.getFolderById("FolderId");
   folder.createFile(zip);  

}

Excel cannot open the file because the file format or file extension is not valid.
Verify that the file has not been corrupted and that the file extension matches the format of the file.