Today I suddenly started getting the above error whenever I try to save a file in emacs 24.5 on Windows 10.
Here is my full list of messages:
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/flymake.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/csharp-mode.el (source)...
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/csharp-mode.el
../site-lisp/csharp-mode.el: `flet' is an obsolete macro (as of 24.3); use either `cl-flet' or `cl-letf'. [2 times]
../site-lisp/csharp-mode.el: (lambda (item) ...) quoted with ' rather than with #'
Done loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/csharp-mode.el
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/csharp-mode.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/desktop.el (source)...
Eager macro-expansion failure: (error "(alist-get (quote display) filtered) is not a valid place expression")
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/desktop.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/session.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/xah-math-input.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/unicode-fonts.el (source)...done
Loading c:/Users/Psalm3_3/GDrive/Tools/Emacs-24.5/site-lisp/php-mode.el (source)...done
zlib library not found
notes.txt has auto save data; consider M-x recover-this-file
Desktop: File "c:/c" no longer exists.
Can't guess python-indent-offset, using defaults: 4 [39 times]
Wrote c:/Users/Psalm3_3/.emacs.d/.emacs.desktop.lock
Desktop: 1 frame, 55 buffers restored, 1 failed to restore.
For information about GNU Emacs and the GNU system, type C-h C-a.
Saving file c:/Users/Psalm3_3/GDrive/Resources/Courses/StanMachLrn/notes.txt...
find-coding-systems-region: Loading charset map: no such file or directory, KOI8-T
Why would emacs suddenly want to use Cyrillic text? Does anyone have any suggestions? TIA.
UPDATE:
Started running from an older emacs setup that didn't have AUCTEX installed, which doesn't give me the error, so it appears to be a problem with this: https://www.gnu.org/software/auctex/