When Build SiteMap, It Said:

The directory the sitemap files are to be written into is not writeable. Please change the permissions on the path to be writeable by the web server or enter a different path in the sitemap options.

to Fix:

1.make a directory name “sitemap” in the web space root directory, and change permission to 777.

2.in vBulltion’s xmlsitemap options, set sitemap path to “sitemap”,no need the first / in full path.

then build ok.