Error while backing up

While trying backup on Ubuntu, the backup wizard shows that it has finished successfully. But I only find an empty backup folder and an empty change-sets folder inside it. the error on the terminal where I ran the Memex Backup Helper shows the error

[Error: ENOENT: no such file or directory, open '/home/user/web/archiver/backup2/backup/change-sets/1695989148620'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/home/user/web/archiver/backup2/backup/change-sets/1695989148620'
}