title: Emacs: Symbol's value as variable is void: custom-theme-load-path
body: <p>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:</p>
  
  <pre><code>Symbol's value as variable is void: custom-theme-load-path
  </code></pre>
  
  <p>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.</p>
  
  <p>This is my <code>~/.emacs-old.el</code> file which aquamacs uses:</p>
  
  <pre><code>(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)
  </code></pre>
  
  <p>Here is a print out from my terminal with a file listing and path:</p>
  
  <pre><code>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$ 
  </code></pre>