"No valid files have been found!"

[cavv4]

C:\Users\Cavv\Program Files\booktab-downloader-master>python3 booktab-downloader.py
Booktab Image Downloader
(C) brearlycoffee.cf

[User list - About 2 users found]
1 booktab@626f6f6b74616240626f
2 miaemail@636176616c69657265

Choose user: 2

[Book list - About 8 books found]
1 9788808312037-1
2 9788808312037-2
3 9788808437884
4 9788808601377
5 9788808653970
6 9788808704382
7 9788808788467
8 9788808937872

Choose book to extract: 4
Selected book: 9788808601377
Source directory: C:\Users\Cavv\AppData\Roaming\Booktab\miaemail@636176616c69657265\9788808601377\
Destination directory: C:/Users/Cavv/Desktop/9788808601377/

Copying files
No valid files have been found!