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I had this error message displayed to me by AUCTeX (already corrected using \ddot{\boldsymbol x})

ERROR: Extra }, or forgotten $.

--- TeX said ---
<recently read> }

l.51 \[ \boldsymbol M\ddot\boldsymbol
                                      x + \boldsymbol K\boldsymbol x =
--- HELP ---
括弧または数式モードのデリミタが正しく対応していません.おそらく{・\[・
\(あるいは$のうちのいずれかを書き忘れたのでしょう.

Google's Translate says it's Japanese...

In the *scratch* buffer I have

(getenv "LANG")
"C.UTF-8"

I'm on Debian Sid with an updated Debian TeXLive and auctex-12.1.2 installed with elpa

What's going on?


Addendum

I had consistently the help message in Japanese using either pdflatex or xelatex or luatex while from the shell I had, in all cases, the help message in English. Both in Emacs and the shell I have LANG set to C.UTF-8.

The problem was solved (so to say) restarting Emacs. In a new copy of Emacs, with a new instance of AUCTeX I have again the help messages in English.

The strange behaviour I experienced is likely due to a casual interaction between the user and Emacs/AUCTeX and I don't expect that we can find what happened, on the other hand I don't want to remove the question but it's fine if you close it.

  • What is the documentclass of your tex file? – Fran Burstall Jun 6 '19 at 16:17
  • @FranBurstall \documentclass[a4paper]{article} – gboffi Jun 6 '19 at 16:34
  • Is your locale the same outside of Emacs? Try spawning a shell in a terminal outside of Emacs and looking at LANG inside of it. – DoMiNeLa10 Jun 6 '19 at 19:52
  • @DoMiNeLa10 My locale is C.UTF-8 in the shell and in the X session. Emacs was started from the window manager that, in turn, was started by my ~/.Xsession (I know, very old fashonied, isn't it?). I add that I don't see Japanese very often, not at all... – gboffi Jun 6 '19 at 20:57
  • What happens if you run latex, eg pdflatex file.tex, on the file outside emacs in a shell? – Fran Burstall Jun 7 '19 at 17:12

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