I converted about 300 books with Libprs 3.7X a while ago. Now when I try to add them again in Libprs 4.49 on a newly formated computer I get the following error. This happens to every single book.

columns book, author are not unique
Detailed traceback:
Traceback (most recent call last):
File "main.py", line 340, in files_dropped
File "main.py", line 377, in _add_books
File "libprs500\gui2\library.pyo", line 128, in add_books
File "libprs500\library\database.pyo", line 1285, in add_books
File "libprs500\library\database.pyo", line 1250, in set_metadata
File "libprs500\library\database.pyo", line 1121, in set_authors
IntegrityError: columns book, author are not unique

I can see the books correctly in Sony ebook Library and open the files.

Any ideas?

Do you have the books already in the database?

It's a new machine so the database is empty.

I've had to remove the attachment because the book is in copyright.
Perhaps you could upload a public domain book to illustrate your problem.

Open a ticket on libprs500.kovidgoyal.net and attach a book.