I'm also having trouble today with the plug-in, but am getting a different error:
calibre, version 6.14.1
ERROR: Unhandled exception: <b>ClientForbiddenError</b>: Error synchronizing data<p>HTTP Error 403: Forbidden</p>
calibre 6.14.1 Portable embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.10.1
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeACSM (0, 0, 16) && Gather KFX-ZIP (from KFX Input) (2, 6, 0) && DeDRM (10, 0, 3) && Package KFX (from KFX Input) (2, 6, 0) && Access Aide (0, 1, 13) && Action Chains (1, 18, 19) && Annotations (1, 17, 13) && Calibre Power Search Plugin (2, 2, 0) && CalibreSpy (1, 0, 92) && Count Pages (1, 12, 1) && DOC Input (1, 0, 1) && Ebook Translator (2, 0, 3) && Editor Chains (0, 8, 3) && EpubMerge (2, 17, 0) && EpubSplit (3, 6, 0) && FanFicFare (4, 20, 0) && FictionDB (1, 4, 1) && Find Duplicates (1, 10, 7) && GetFileName (0, 2, 0) && Goodreads (1, 7, 3) && Goodreads_Rating (4, 0, 0) && Job Spy (1, 0, 205) && KFX metadata reader (from KFX Input) (2, 6, 0) && KFX Input (2, 6, 0) && Set KFX metadata (from KFX Output) (2, 3, 1) && KFX Output (2, 3, 1) && Kindle Collections (1, 7, 29) && KindleUnpack - The Plugin (0, 83, 1) && Mass Search-Replace (1, 7, 1) && Media File Importer (1, 0, 27) && Modify ePub (1, 8, 2) && MultiColumnSearch (1, 0, 96) && Open With (1, 8, 1) && OverDrive Libby (0, 1, 9) && Overdrive Link (2, 57, 0) && Reading List (1, 15, 1) && Save To Format (0, 0, 6) && Search The Internet (1, 10, 4) && Similar Stories (1, 0, 58) && Standard Ebooks (1, 0, 0) && TTS to MP3 (0, 6, 0) && View Manager (1, 10, 2) && Wiki Reader (2, 2, 1) && all recipes Recipe Reader (1, 0, 2) && Overdrive Link Metadata Source (2, 57, 0)
Traceback (most recent call last):
File "calibre_plugins.overdrive_libby.libby.client" , line 518, in send_request
File "urllib\request.py", line 525, in open
File "urllib\request.py", line 634, in http_response
File "urllib\request.py", line 563, in error
File "urllib\request.py", line 496, in _call_chain
File "urllib\request.py", line 643, in http_error_default
urllib.error.HTTPError: HTTP Error 403: Forbidden
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "calibre_plugins.overdrive_libby.workers", line 351, in run
File "calibre_plugins.overdrive_libby.libby.client" , line 631, in sync
File "calibre_plugins.overdrive_libby.libby.client" , line 538, in send_request
File "calibre_plugins.overdrive_libby.libby.errors" , line 143, in process
calibre_plugins.overdrive_libby.libby.errors.Clien tForbiddenError: <calibre_plugins.overdrive_libby.libby.errors.Clie ntForbiddenError; http_status=403, msg='HTTP Error 403: Forbidden', error_response='{"result":"missing_chip"}''>