Thank you for you kind update
My website is:
http://tinyurl.com/3uyuanz
I just added more command on robots.txt :
User-agent: *
Disallow: /cgi-bin
Disallow: /wp-admin
Disallow: /wp-includes
Disallow: /wp-content/plugins
Disallow: /wp-content/cache
Disallow: /wp-content/themes
Disallow: /trackback
Disallow: /feed
Disallow: /comments
Disallow: */trackback
Disallow: */feed
Disallow: */comments
Disallow: /*?*
Disallow: /*?
Disallow: /xmlrpc
Disallow: /tag/*
Disallow: /tag
Disallow: /rss
Disallow: /archives
Disallow: /wget/
Not sure if this correct ?
Also not sure if the current W3 Total Cache Plug-in is concern with the URL 404 error ?
After that try delete plug-in that seem to related to link generation issue like sitemap, link checking, bot checker plug-in.
I also deleted the file sitemap in the server as i'm not sure if this file link to invalid URLs ( as this file might generated from plugin that not compatible with my permalink/ word press config.)
Will see one or two days for update about crawling issue.
Thanks Mr. Juggledad and all Readers.