Why the Url Listed in my site map cant be crawled by Google

[boohlick]

This are list of links in my sitemap.xml that google says that they cant crawl

http://www.nationalvisas.com.au/resource-partner/Housing/H_page1.html
http://www.nationalvisas.com.au/resource-partner/resource-partner.html
http://www.nationalvisas.com.au/resource-partner/Others/Other_page1.html
http://www.nationalvisas.com.au/resource-partner/Education/Edu_page1.html
http://www.nationalvisas.com.au/resource-partner/Travel/Travel_page1.html
http://www.nationalvisas.com.au/resource-partner/Newspapers/N_P_page1.html
http://www.nationalvisas.com.au/resource-partner/Business_Economy/B_E_page1.html
http://www.nationalvisas.com.au/resource-partner/Directories/Directory_page1.html
http://www.nationalvisas.com.au/resource-partner/Computers_Internet/C_I_page1.html

They all return HTTP Error (https://www.google.com/webmasters/sitemaps/docs/en/stats.html#notfound)
Im really confused because :
They are not broken links.
They the same properties as the the folder
The file exist

What is the reason why google cant crawl this page?
Can somebody explain to me the reason why google has problems in crawling this pages

Thanks

[randymorin]

It's important to remember that Sitemaps is Beta. I find a lot of users are getting confused, including myself.

[boohlick]

Does it mean that google still crawls the page?

[chachi]

If the page works and your website does not suffer from a lot of down time, I would not worry about it.