Ok, I’ve solved it:

;(require 'org)
;(require 'org-install)
;(add-to-list 'org-modules "org-habit")
(setq org-modules '(org-habit))

--
Tobi

PGP PUBLIC KEY: http://pgp.mit.edu/pks/lookup?search=0xCD463AC1&op=index

> On 30 Aug 2015, at 10:33, Tobias Frischholz <tobias@friolz.com> wrote:
> 
> Hi there,
> 
> I somehow get this message when starting up Emacs. Searching the net didn't help.
> 
> Here's my init.el:
> 
> (setq user-full-name "Tobias Frischholz"
>      user-mail-address "tobias@friolz.com")
> 
> (package-initialize)
> 
> ;; https://github.com/purcell/exec-path-from-shell
> (when (memq window-system '(mac ns))
>  (exec-path-from-shell-initialize))
> 
> (require 'org)
> (require 'org-install)
> (add-to-list 'org-modules "org-habit")
> 
> (setq org-todo-keywords
>       '((sequence "TODO(t)" "WAIT(w@/!)" "|" "DONE(d!)" "CANCELED(c@)")))
> 
> (global-set-key "\C-cl" 'org-store-link)
> (global-set-key "\C-ca" 'org-agenda)
> (global-set-key "\C-cc" 'org-capture)
> (setq org-default-notes-file "~/org/organizer.org")
> (global-set-key (kbd "C-c o")
>                (lambda () (interactive) (find-file "~/org/organizer.org")))
> (global-set-key "\C-cb" 'org-iswitchb)
> 
> (setq org-agenda-files (list "~/org/organizer.org"))
> 
> (setq org-feed-alist
>          '(("Hacker News"
>              "https://news.ycombinator.com/rss"
>              "~/org/feeds.org" "Hacker News Entries")
> 	  ("SZ"
> 	  "http://rss.sueddeutsche.de/app/service/rss/alles/index.rss?output=rss"
> 	  "~/org/feeds.org" "SZ Entries")))
> 
> 
> (require 'package)
> (add-to-list 'package-archives
>             '("melpa" . "https://melpa.org/packages/"))
> 
> (add-to-list 'load-path "~/elisp/erc")
> (require 'erc)
> 
> (add-to-list 'load-path "~/.elisp/gnuplot-mode/")
> (require 'gnuplot)
> 
> (setq inhibit-startup-message t)
> 
> (custom-set-variables
> ;; custom-set-variables was added by Custom.
> ;; If you edit it by hand, you could mess it up, so be careful.
> ;; Your init file should contain only one such instance.
> ;; If there is more than one, they won't work right.
> '(custom-enabled-themes (quote (sanityinc-solarized-light)))
> '(custom-safe-themes
>   (quote
>    ("4aee8551b53a43a883cb0b7f3255d6859d766b6c5e14bcb01bed572fcbef4328" "4cf3221feff536e2b3385209e9b9dc4c2e0818a69a1cdb4b522756bcdf4e00a4" default))))
> (custom-set-faces
> ;; custom-set-faces was added by Custom.
> ;; If you edit it by hand, you could mess it up, so be careful.
> ;; Your init file should contain only one such instance.
> ;; If there is more than one, they won't work right.
> )
> 
> I've added the STYLE "habit" to my TODOs. Everything seems to work fine.
> However the consistency graph is also missing.
> 
> Any help would be greatly appreciated!
> 
> --
> Tobi
> 
> PGP PUBLIC KEY: http://pgp.mit.edu/pks/lookup?search=0xCD463AC1&op=index
>