Also seeing this error:
calibre, version 2.66.0
ERROR: Cannot add books: Failed to add some books, click "Show details" for more information.
Worker process crashed while executing job
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\pool.py", line 103, in recv
File "site-packages\calibre\utils\ipc\__init__.py", line 21, in eintr_retry_call
EOFError
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