The following is what I got when I tried to delete a book.
Error in job: Remove books from device
[Error 3] The system cannot find the path specified: u'I:\\database/media/books/books\\libprs500_7.lrf'
Traceback (most recent call last):
File "libprs500\gui2\jobs.pyo", line 79, in run
File "libprs500\gui2\device.pyo", line 116, in delete_books
File "libprs500\devices\prs505\driver.pyo", line 387, in delete_books
WindowsError: [Error 3] The system cannot find the path specified: u'I:\\database/media/books/books\\libprs500_7.lrf'