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Old 10-12-2019, 02:52 PM   #346
theducks
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Quote:
Originally Posted by JVarga View Post
This is a rather old thread, but I hope somebody is still reading it...
I keep failing to extract the ISBN from PDF files (all PDF-s) with the error message:

Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\simple_worker.py", line 290, in main
File "calibre_plugins.extract_isbn.pdf", line 86, in get_isbn
UnboundLocalError: local variable 'scanner' referenced before assignment

It is quite an old error; at present, I use Calibre 4.1.0 under Windows 10.

Can anybody help how to solve or bypass the problem?
This is possibly a compatibility issue with 4.x.
As a temporary work around. Install the 32 bit version of Calibre 3.48 (assumes you are running 64bit) You just can't have BOTH RUNNING at the same time.
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Old 10-12-2019, 06:19 PM   #347
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Extract ISBN, from PDF's, works for me on version 4.1 (just did one) - must be certain PDF's.

BR
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