Wrong Type Error When Publishing Project

[Brian Callies <brian@gibbous.org>]

Good Day,

I'm sure I must be doing something obviously wrong, but I've had no 
success at publishing a project I've just created. I've been working on 
this error for some time, incidentally fixing other mistakes, but I'm 
unable to get it working.  I get the same error on Arch Linux, as I do 
on Win8. I'm using Org-mode 8.0.5.

I get the following error: Wrong type argument: stringp

My project config is below. Images-w and css-w export fine on their own, 
but alpharednotes-w and AlphaRedWin both fail with the error above.

(setq org-publish-project-alist
       '(
     ("alpharednotes-w"
      :base-directory "C:/Users/bcallies/Dropbox/RPG/Alpha Red/org"
      :base-extension "org"
      :publishing-directory "C:/Users/bcallies/Dropbox/RPG/Alpha 
Red/org/html/"
;     :recursive t
      :publishing-function org-publish-org-to-html
;     :headline-levels 5
;     :auto-preamble t
      )
     ("images-w"
      :base-directory "C:\\Users\\bcallies\\Dropbox\\RPG\\Alpha 
Red\\org\\img"
      :base-extension "jpg\\|gif\\|png"
      :publishing-directory "C:\\Users\\bcallies\\Dropbox\\RPG\\Alpha 
Red\\org\\html\\images\\"
      :publishing-function org-publish-attachment
      )
     ("css-w"
      :base-directory "C:\\Users\\bcallies\\Dropbox\\RPG\\Alpha 
Red\\org\\css"
      :base-extension "css"
      :publishing-directory "C:\\Users\\bcallies\\Dropbox\\RPG\\Alpha 
Red\\org\\html\\css\\"
      :publishing-function org-publish-attachment
      )
     ("AlphaRedWin" :components ("alpharednotes-w" "images-w" "css-w"))
))

Thank You,
Brian