[Jimmie]

I have been using the superb Calibre software for about eight years.
Today, after updating to version 3.39.0 I have had problems copying books between libraries. An error report is shown - an example of which I quote below:

calibre, version 3.39.0
ERROR: Failed to copy books: Could not copy any books, click "Show Details" for more information.

Failed to copy a book, see below for details

Copying: The Jack Noble Series: Books 4-6 (The Jack Noble Series Box Set) failed, with error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\actions\copy_to_library.py", line 160, in _doit
File "site-packages\calibre\gui2\actions\copy_to_library.py", line 175, in do_one
File "site-packages\calibre\db\copy_to_library.py", line 109, in copy_one_book
File "site-packages\calibre\db\copy_to_library.py", line 63, in postprocess_copy
File "site-packages\calibre\db\cache.py", line 63, in call_func_with_lock
TypeError: set_conversion_options() takes at most 3 arguments (4 given)

I shall be most grateful for help in resolving this problem. Thank you in advance.