pksylvia on "[Plugin: Google XML Sitemaps] There was a problem while notifying Google"

when i was installed this plugin ,this notife is showed "There was a problem while notifying Google". and when i clicked this link, it showed this :

Ping Test

Trying to ping: http://www.google.com/webmasters/sitemaps/ping?sitemap=http%3A%2F%2Fwww.pkvibratingscreen.com%2Fsitemap.xml. The sections below should give you an idea whats going on.

Errors, Waings, 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: Connection timed out after 10001 milliseconds in /home/screwwmr/public_html/pkvibratingscreen.com/wp-content/plugins/google-sitemap-generator/sitemap-core.php on line 2052
Result (text only):

Result (HTML):
what's the mean of this ?
please help me.!!!

https://wordpress.org/plugins/google-sitemap-generator/