[ownedbycats]

While running from source (6.14.1*) but also occurring on stable, I installed CalibreSpy from the plugin manager. Trying to open my library in either mode results in this error though:

calibre, version 6.14.1
ERROR: Unhandled exception: <b>NameError</b>:name 'QtCore' is not defined

calibre 6.14.1*  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) && DeDRM (10, 0, 3) && Action Chains (1, 18, 5) && Baen (1, 1, 0) && Barnes & Noble (1, 4, 0) && CalibreSpy (1, 0, 91) && Comments Cleaner (1, 9, 0) && Count Pages (1, 12, 1) && Embed Comic Metadata (1, 6, 5) && EpubCheck (0, 2, 4) && EpubMerge (2, 15, 0) && EpubSplit (3, 5, 0) && Extract ISBN (1, 6, 0) && FanFicFare (4, 22, 1) && Fantastic Fiction (1, 6, 0) && Favourites Menu (1, 3, 0) && Find Duplicates (1, 10, 7) && Generate Cover (2, 3, 2) && GetFileName (0, 2, 0) && Goodreads (1, 7, 3) && Import List (1, 9, 0) && Job Spy (1, 0, 226) && Kindle hi-res covers (0, 5, 0) && KindleUnpack - The Plugin (0, 83, 1) && Kobo Books (1, 9, 2) && Kobo Utilities (2, 16, 7) && KoboTouchExtended (3, 6, 3) && Last Modified (0, 8, 4) && Manage Series (1, 5, 0) && Modify ePub (1, 8, 1) && MultiColumnSearch (1, 0, 96) && Obok DeDRM (7, 2, 1) && Open With (1, 8, 1) && Overdrive Link (2, 54, 0) && Quality Check (1, 13, 3) && Reading List (1, 15, 1) && Search The Internet (1, 10, 0) && SmartEject (2, 5, 0) && Standard Ebooks (1, 0, 0) && Sum Column (0, 3, 3) && View Manager (1, 10, 2) && Walk Search History (1, 5, 3) && Overdrive Link Metadata Source (2, 54, 0)
Traceback (most recent call last):
  File "calibre_plugins.calibrespy.ui", line 85, in entirely_read_only
  File "calibre_plugins.calibrespy.ui", line 122, in run_calibrespy_from_gui
  File "calibre_plugins.calibrespy.calibrespy_dialog", line 328, in __init__
  File "calibre_plugins.calibrespy.calibrespy_dialog", line 3668, in build_stylesheets
  File "calibre_plugins.calibrespy.ui_theme", line 61, in __init__
NameError: name 'QtCore' is not defined

I get a similar error when running it from the main batch file.

Any idea what maybe went wrong?