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I am following the directions laid out in this answer to edit my sshd_config file.

However when I try to save I get:

byte-code: Wrong type argument: listp, 126

Does anybody know why this would be and how I could fix it? (this prevents me from saving my file)

EDIT

Thanks to the comments I was able to narrow down the issue to the following lines in my init file:

(setq tramp-default-method "ssh")  
(setq tramp-auto-save-directory auto-save-location)  
(setq tramp-backup-directory-alist auto-save-location)

Commenting them out fixed my issue

Startec
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  • (1) Use toggle-debug-on-error to get a stack trace for the error. (2) Try editing and saving the file using a separate emacs -Q instance, which will indicate whether or not the problem was caused by your config. – phils Apr 13 '17 at 01:28
  • Uh-oh. ``toggle-debug-on-errordoes not print out anything different but trying (2)emacs -Q` lets me save the file with no issues. I take it this means it is a problem with my config? Any ideas how to start debugging that? – Startec Apr 13 '17 at 01:34
  • Yes. Recursively bisect your init file. Comment out 1/2 of it, then 3/4, 7/8, 15/16,... You can use command comment-region to comment out selected text. With plain C-u it uncomments. Sounds slow but is fast (binary search). – Drew Apr 13 '17 at 02:11
  • After enabling debug-on-error, you tried to save the file again, yes? And it failed with the same error, but didn't produce a backtrace/debugger window? – phils Apr 13 '17 at 02:30
  • Yes that is exactly what happened. In messages I see debug-on-error enabled globally but I don't get a stack Trace and the error is the same. – Startec Apr 13 '17 at 02:32
  • Enable tramp-debug-on-error. It could result in better backtraces. – Michael Albinus Apr 13 '17 at 10:26
  • @MichaelAlbinus it does not look like that is a real command. However, I did try to enable (setq debug-on-error t debug-on-signal t) but I just got the same error message.

    Commenting out my entire init file and re-reading it doesn't do anything, so there must be some variable that is being set on start and not working.

     – Startec Apr 13 '17 at 19:21
  • I meant (setq tramp-debug-on-error t). – Michael Albinus Apr 15 '17 at 05:46

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