When sending books to 505 I'm getting the following:
'list' object has no attribute 'add_book'
Detailed traceback:
Traceback (most recent call last):
File "calibre\gui2\__init__.pyo", line 144, in dispatch
File "main.py", line 737, in books_uploaded
File "calibre\gui2\device.pyo", line 151, in add_books_to_metadata
File "calibre\devices\prs505\driver.pyo", line 464, in add_books_to_metadata
AttributeError: 'list' object has no attribute 'add_book'
The book get's send over and works
