gnus-summary-followup-with-original not working (nnheader-parse-naked-head)

[Angel de Vicente]

Hello,

I've been using this command for ages, but yesterday I did upgrade my
system, and now it has stopped working. I wonder if anybody has seen
this error and/or has some advice on fixing it.

When using the command gnus-summary-followup-with-original, I now get a
reply buffer without the original mail text, and a message in the
minibuffer that reads:

,----
| save-restriction: Symbol’s function definition is void: 
nnheader-parse-naked-head
`----

My Emacs and Gnus versions are:

 + GNU Emacs 28.1 (build 1, x86_64-pc-linux-gnu) of 2022-04-27
 + Gnus v5.13

Any help appreciated,
-- 
Ángel de Vicente
http://angel-de-vicente.blogspot.com/