Emacs: Symbol's value as variable is void: custom-theme-load-path
I'm trying to configure Aquamacs to use the solarized theme. I've already configured aquamacs to use erlang and that works fine. After trying to add the custom theme to the load path however, I get the following error when launching aquamacs:
Symbol's value as variable is void: custom-theme-load-path
I'm very new to emacs and I'm still jumping through hoops for almost everything and this has me stunned. I've doublechecked the path a zillion times so I'm probably just not understanding how to add the theme path properly.
This is my ~/.emacs-old.el file which aquamacs uses:
(setq load-path (cons"/usr/local/Cellar/erlang/R15B01/lib/erlang/lib/tools-2.6.7/emacs" load-path))
(setq erlang-root-dir "/usr/local/Cellar/erlang/R15B01/lib/erlang/lib")
(setq exec-path (cons "/usr/local/Cellar/erlang/R15B01/lib/erlang/bin" exec-path))
(require 'erlang-start)
(add-to-list 'custom-theme-load-path "~/.emacs.d/emacs-color-theme-solarized/")
(load-theme 'solarized-[light|dark] t)
Here is a print out from my terminal with a file listing and path:
Daniel:emacs-color-theme-solarized daniel$ pwd
/Users/daniel/.emacs.d/emacs-color-theme-solarized
Daniel:emacs-color-theme-solarized daniel$ ls -l
total 208
-rw-r--r-- 1 daniel staff 1061 Mar 4 14:04 LICENSE
-rw-r--r-- 1 daniel staff 8744 Mar 4 14:04 README.md
drwxr-xr-x 7 daniel staff 238 Mar 4 14:20 color-theme-solarized-20130304
-rw-r--r-- 1 daniel staff 36864 Mar 4 14:20 color-theme-solarized-20130304.tar
-rw-r--r-- 1 daniel staff 109 Mar 4 14:04 color-theme-solarized-pkg.el
-rw-r--r-- 1 daniel staff 1846 Mar 4 14:04 color-theme-solarized.el
-rwxr-xr-x 1 daniel staff 309 Mar 4 14:04 makepkg.sh
-rw-r--r-- 1 daniel staff 169 Mar 4 14:04 solarized-dark-theme.el
-rw-r--r-- 1 daniel staff 28902 Mar 4 14:04 solarized-definitions.el
-rw-r--r-- 1 daniel staff 170 Mar 4 14:04 solarized-light-theme.el
Daniel:emacs-color-theme-solarized daniel$
Answer
custom-theme-load-path was added in Emacs 24 (see the
NEWS file). You must have Emacs 23 or older, which means you'll
have to load the theme the old way.
If you don't have it already (try M-x color-theme-select if you're
not sure), download and install color-theme.
Then, load the solarized theme with the full path:
(load-file "~/.emacs.d/emacs-color-theme-solarized/color-theme-solarized.el")
Once it's loaded, then you can either run M-x color-theme-solarized
or load it directly from your .emacs file with
(color-theme-solarized)