Hi everyone, I was following the guidance utilizing kitti2bag to visualize the pcd, however recently face this problem, havent found ways to solve, pls help me, Thanks in advance

the terminal was run in this directory, which contains the following files:
zhong1@ubuntu:~/visualize pcd$ ls
2011_09_26
2011_09_26_drive_0005_sync.zip
kitti2bag-master.zip
2011_09_26_calib.zip
kitti2bag-master

call the generating command:
zhong1@ubuntu:~/visualize pcd$ kitti2bag -t 2011_09_26 -r 0002 raw_synced
Traceback (most recent call last):
File "/usr/local/bin/kitti2bag", line 394, in
main()
File "/usr/local/bin/kitti2bag", line 302, in main
kitti = pykitti.raw(args.dir, args.date, args.drive)
File "/home/zhong1/.local/lib/python3.8/site-packages/pykitti/raw.py", line 35, in init
self._load_timestamps()
File "/home/zhong1/.local/lib/python3.8/site-packages/pykitti/raw.py", line 253, in _load_timestamps
with open(timestamp_file, 'r') as f:
FileNotFoundError: [Errno 2] No such file or directory: '/home/zhong1/visualize pcd/2011_09_26/2011_09_26_drive_0002_sync/oxts/timestamps.txt'

->>successfully generated "kitti_2011_09_26_drive_0002_synced.bag" however that file is empty @@