[Plugin: Google XML Sitemaps] error on publish or update posts

I use the latest version of the plugin Google XML Sitemaps, v3.2.4, now when i publish new articles or update existing one i get this error message:

Warning: mysql_connect() [function.mysql-connect]: Too many open links (2) in /home/mhd-01/www.digitalking.it/htdocs/wp-content/plugins/google-sitemap-generator/sitemap-core.php on line 1796

Warning: Cannot modify header information – headers already sent by (output started at /home/mhd-01/www.digitalking.it/htdocs/wp-content/plugins/google-sitemap-generator/sitemap-core.php:1796) in /home/mhd-01/www.digitalking.it/htdocs/wp-includes/pluggable.php on line 897

however the post will be published/updated.