8 Block error in first line

[CoCuCoH41k]

hi, I wanted to run an animation render with 600 frames, everything went well until the beginning of the 8th block, it gave an error in the first line and I do not know what to do, please help =(

ERR

StopIteration Traceback (most recent call last)
in ()
----> 1 path, dirs, files_folder = next(os.walk("output"))
2 output_folder_name = output_name.replace('#', '') + 'render'
3
4 if download_type == 'gdrive_direct':
5 pass

StopIteration: