Backup Folder Undefined in Google Apps Script

Using previously made script and installing on my google drive to backup google data (excel) to a daily zip file.
Created folder and trying to save the script but it throws an error on line 16. Backup folder undefined.

I have ID’d my backup folder
var BACKUP_FOLDER_ID = ‘1vaT94n4t9Z6_Z5hvhhQxkN0NWgs8eYQl’;

Here is the function BackupAll that throws the error
function backupAll() {
var backupFolder = DriveApp.getFolderById(BACKUP_FOLDER_ID);

Run Error Message:
Exception: No item with the given ID could be found. Possibly because you have not edited this item or you do not have permission to access it.
backupAll @

Completely new to this so need simple directions if someone would be so kind.


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