Calibre not starting: bypy frozen importer

mortha · 03-10-2021, 03:13 AM

Hi, I've used Calibre for many years now, and suddenly it's not starting up at all. I just get the following error message:

There was an error initializing the bypy frozen importer:
<class 'FileNotFoundError'>: [WinError 2] The system cannot find the file specified: 'C:\\Program Files\\Calibre2\\app\\bin\\python-lib.bypy.frozen'
Traceback (most recent call last):
File bypy-importer.py, line 337, in <module>
File bypy-importer.py, line 273, in __init__

Any suggestions? Should I uninstall and reinstall (and can I do this without losing the library and plugins?

I'm on Windows 10 Home, version 1909. What has changed since I last successfully opened Calibre: I had a failed Windows feature update to version 20H2 and updated the Thunderbolt driver on my laptop. The computer has been restarted after these and before trying to start Calibre.

kovidgoyal · 03-10-2021, 06:24 AM

Either repair the install or uninstall and re-install. Which wont affect any settings/books.

mortha · 03-10-2021, 07:57 AM

Thank you, Kovid, that was easy and straightforward, and I feel a little foolish

Thank you also for creating and maintaining this very fine software, which has helped keep me sane for many years.

03-10-2021, 03:13 AM	#1
mortha Junior Member Posts: 2 Karma: 10 Join Date: Mar 2021 Device: Kindle	Calibre not starting: bypy frozen importer Hi, I've used Calibre for many years now, and suddenly it's not starting up at all. I just get the following error message: There was an error initializing the bypy frozen importer: <class 'FileNotFoundError'>: [WinError 2] The system cannot find the file specified: 'C:\\Program Files\\Calibre2\\app\\bin\\python-lib.bypy.frozen' Traceback (most recent call last): File bypy-importer.py, line 337, in <module> File bypy-importer.py, line 273, in __init__ Any suggestions? Should I uninstall and reinstall (and can I do this without losing the library and plugins? I'm on Windows 10 Home, version 1909. What has changed since I last successfully opened Calibre: I had a failed Windows feature update to version 20H2 and updated the Thunderbolt driver on my laptop. The computer has been restarted after these and before trying to start Calibre.

03-10-2021, 07:57 AM	#3
mortha Junior Member Posts: 2 Karma: 10 Join Date: Mar 2021 Device: Kindle	Thank you - solved Thank you, Kovid, that was easy and straightforward, and I feel a little foolish Thank you also for creating and maintaining this very fine software, which has helped keep me sane for many years.

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03-10-2021, 06:24 AM	#2
kovidgoyal creator of calibre Posts: 45,353 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Either repair the install or uninstall and re-install. Which wont affect any settings/books.

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