[OBoyle]

Not sure what version of Calibre (Win 1-64) I was running, but it was at least 5.5. Not had one bit of trouble until today. I invoke Calibre. Default to My Reader. Swap to “Master” which is ALL of my books. Display shows 7 books – the last group added to both MY Reader AND Master. Now I’ve an error…

ERROR: Unhandled exception: <b>NameError</b>:name 'xrange' is not defined

I restore an earlier version , 5.4.2, and get the identical result. Not at all certain what to do, but I’ve many family-member specific libraries that I’m concerned about losing.
Does anyone have a clue what I’m doing wrong?

Thanks,

JLOB

Error text....

calibre, version 5.4.2
ERROR: Unhandled exception: <b>NameError</b>:name 'xrange' is not defined
calibre 5.4.2 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: EpubCheck (0, 2, 2) && Find Duplicates (1, 6, 2) && Quality Check (1, 9, 11)
Traceback (most recent call last):
File "calibre\startup.py", line 143, in slot
File "calibre\gui2\actions\choose_library.py", line 259, in <lambda>
File "calibre\gui2\actions\choose_library.py", line 607, in switch_requested
File "calibre\gui2\ui.py", line 737, in library_moved
File "calibre_plugins.find_duplicates.action", line 61, in library_changed
File "calibre_plugins.find_duplicates.duplicates", line 69, in __init__
File "calibre_plugins.find_duplicates.config", line 111, in get_exemption_lists
NameError: name 'xrange' is not defined