[Plugin: Google XML Sitemaps] WP_DEBUG Error In XML Sitemap Generator

Hi,

when i rebuild the sitemap i m getting this error:

Your sitemap was last built on November 21, 2011 10:22 pm.
Your sitemap (zipped) was last built on November 21, 2011 10:22 pm.
There was a problem while notifying Google. View result
Ask.com was successfully notified about changes.
It took 5.18 seconds to notify Ask.com, maybe you want to disable this feature to reduce the building time.
The building process took about 15.41 seconds to complete and used 16 MB of memory.
If you changed something on your server or blog, you should rebuild the sitemap manually.
If you encounter any problems with the build process you can use the debug function to get more information.
There is a new beta version of this plugin available which supports the new multi-site feature of WordPress as well as many other new functions! More information and download

================ View Result ===============

Errors, Warnings, Notices:
WP_DEBUG was set to false somewhere before. You might not see all debug information until you remove this declaration!

Notice: WP HTTP API Web Request failed: name lookup timed out in /wp-content/plugins/google-sitemap-generator/sitemap-core.php on line 2364
Result (text only):
Result (HTML):

How i solve this issue ?? PLZ Help Me Guys.

http://ww.wp.xz.cn/extend/plugins/google-sitemap-generator/