When trying to start S-plus 6.2.1 for linux using Emacs 25.2.1 lucid and ess-17.11.2 under Elementary OS 5.0 (based on Ubuntu 18.04 LTS), I get the following error:
ess-command: Wrong number of arguments: #[(com &optional buf sleep) "Á!" [com ess-eval-linewise] 2
("/usr/share/emacs25/site-lisp/ess/ess-dde.elc" . 4843)], 7
It seems that an S+ process is running, but when I try to issue a command, I get this error:
ess-get-process: No ESS process is associated with this buffer now
How do I fix it? I tried with ess-18.10, but got another error telling that it could not find the Splus program although it is in the PATH.