[Plugin: Google XML Sitemaps with Multisite support] can not activate the plugin

Hi tried to activate the plugin, but am getting the following error:

Fatal error: Cannot redeclare class GoogleSitemapGeneratorLoader in /home/justfla/public_html/wp-content/plugins/google-xml-sitemaps-with-multisite-support/sitemap.php on line 23

please help.

http://ww.wp.xz.cn/extend/plugins/google-xml-sitemaps-with-multisite-support/