After upgrading packages in emacs, I have the following error message when trying to run R (M-x R): Symbol's function definition is void: ess-s-define-runners. I can't find where the error is. Here's my ESS set-up in my init file, but I don't think it's coming from there:

(setq ess-eval-visibly-p nil)
(use-package polymode
:ensure f
:init (require 'poly-R)
      (require 'poly-markdown)
      (require 'poly-noweb)
(add-to-list 'auto-mode-alist '("\\.md" . poly-markdown-mode))
(add-to-list 'auto-mode-alist '("\\.Snw" . poly-noweb+r-mode))
(add-to-list 'auto-mode-alist '("\\.Rnw" . poly-noweb+r-mode))
(add-to-list 'auto-mode-alist '("\\.Rmd" . poly-markdown+r-mode)))
(add-hook 'ess-R-post-run-hook 'smartparens-mode)
(global-set-key (kbd "C-S-m") (lambda () (interactive) (insert " %>% ")))

1 Answer 1


This was a known bug and updating to latest ESS version solves the problem. See https://github.com/emacs-ess/ESS/issues/596.

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