I cannot add a book when the cover tag -c is present in the cli. If it is absent, the book is being added successfully.
Code:
Traceback (most recent call last):
File "site.py", line 77, in main
File "site-packages/calibre/db/cli/main.py", line 255, in main
File "site-packages/calibre/db/cli/main.py", line 55, in run_cmd
File "site-packages/calibre/db/cli/cmd_add.py", line 366, in main
File "site-packages/calibre/db/cli/cmd_add.py", line 163, in do_add
File "site-packages/calibre/ebooks/metadata/book/serialize.py", line 28, in read_cover
AttributeError: 'unicode' object has no attribute 'cover_data'