Dear All:
When I do org-publish-project command, the error message occurs like this:
>>>>Symbol' function definition is void: org-export-as-html

I just update my org-mode to the newest using: package-install org .
My .emacs file is very simple:
(add-to-list 'load-path "~/.emacs.d/lisp")                                      
;(add-to-list 'custom-theme-load-path "~/.emacs.d/lisp")                        
(require 'color-theme )                                                         
(color-theme-initialize)                                                        
(color-theme-arjen)                                                             
;set the souce code block to highlight.                                         
;(setq org-src-frontify-natively                                                
;(require 'org-install)

Also my publish setup is quite simple as in the manual:
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This still seems is an version conflict problem, but I am not sure. The thing is before upgrading, I can use org-mode 7.9.3f which is the emacs 24.3 default version.

Regards, Ming