error of folders setting

[TigerHH6866]

log:

23:49:48-154931 INFO Start training LoRA Standard ...
23:49:48-159016 ERROR The following folders do not match the required pattern _: /root/autodl-tmp/train/images/.ipynb_checkpoints
23:49:48-162292 ERROR Please follow the folder structure documentation found at docs\image_folder_structure.md ...
23:49:48-164797 INFO Error: '.ipynb_checkpoints' does not contain an underscore, skipping...
23:49:48-167598 INFO Folder 10_oldtradition: 60 images found
23:49:48-168564 INFO Folder 10_oldtradition: 600 steps

its strange, i checked the folder setting i think is ok,but when running log telled error. infact it can read folder and images.
anyone can tell me where is mistake？