[ESS] Turning off ess-smart-underscore

[Michael Hoffman]

Hi, I'm using ESS 5.2.8 on GNU Emacs 21.3.1 on a Fedora Core 3 Linux 
system trying to turn off ess-smart-underscore. I find it to be annoying 
and surprising behavior considering how often underscores are used in 
identifiers.

The readme <http://ess.r-project.org/Manual/readme.html> says that I 
should be able to turn this off using (ess-smart-underscore nil) in my 
.emacs file. However, I get this error:

Debugger entered--Lisp error: (wrong-number-of-arguments #[nil 
"Ã`!„ Äš„ Åc‡	G`
e\\Yƒ/ ŠÆ
!ˆÇ	!)ƒ/ È
!ˆÅc‚4 É ˆ	c)‡" [ess-language ess-S-assign assign-len 
ess-inside-string-or-comment-p "S" "_" backward-char looking-at 
delete-backward-char delete-horizontal-space] 3 
("/usr/share/emacs/site-lisp/emacs-ess-5.2.8/essl-s.elc" . 13355) nil] 1)
   ess-smart-underscore(nil)
   eval-buffer(#<buffer  *load*> nil "~/.emacs" nil t)
   load-with-code-conversion("/home/hoffman/.emacs" "~/.emacs" t t)
   load("~/.emacs" t t)
   #[nil "…— 	Æ=ƒ ÇÈQ‚5 	É=ƒ' ÊÇËÌ#ƒ# Í‚5 ΂5 	Ï=ƒ1 Ђ5 
ÇÑQÒÓ\nÒ‰#ˆÒ=ƒF ˃ˆ Ô!Õšƒˆ Ö!‰
×P
Ø
!ƒd
‚o Ø\f!ƒn \f‚o ˉƒ‡ Ù\f\"ƒ… ÚÛ\f#ˆÜÝ!ˆ\f*†– Ë
 ÓÞÒ‰#))‡" 
[init-file-user system-type user-init-file-1 user-init-file source alt 
ms-dos "~" "/_emacs" windows-nt directory-files nil 
"^\\.emacs\\(\\.elc?\\)?$" "~/.emacs" "~/_emacs" vax-vms 
"sys$login:.emacs" "/.emacs" t load file-name-extension "elc" 
file-name-sans-extension ".el" file-exists-p file-newer-than-file-p 
message "Warning: %s is newer than %s" sit-for 1 "default" 
inhibit-default-init inhibit-startup-message] 5]()
   command-line()
   normal-top-level()

Could you please make a suggestion on how I can fix this?

Best regards,
-- 
Michael Hoffman