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@iiui awan

I believe this was discussed before here on the forum but to fix the problem you need to change file: sitemap_generator from line 200 to 208 with:

// PING SEARCH ENGINES WITH NEW SITEMAP - HELP FUNCTION
function ais_sitemap_ping_engines() {
  // GOOGLE
  osc_doRequest( 'http://www.google.com/webmasters/sitemaps/ping?sitemap='.urlencode(osc_base_url() . 'sitemap.xml'), array());
  // BING
  osc_doRequest( 'http://www.bing.com/webmaster/ping.aspx?siteMap='.urlencode(osc_base_url() . 'sitemap.xml'), array());
  // YAHOO!
  //osc_doRequest( 'http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid='.osc_page_title().'&url='.urlencode(osc_base_url() . 'sitemap.xml'), array());
}
In fact you need to disable yahoo osc_doRequest with 2 //   

@mwindey
This was made months/years ago:
https://osclasspoint.com/osclass-plugins/backoffice/all-in-one-seo-plugin-i47#changelog

[3.1.3] Yahoo sitemap api disabled as this service was shut down