[Plugin: HeadSpace2 SEO] Error Cause Server Down

My server frequently said memory used up, and when I trace the log file, it seems due to an error in headspace2.

Why? What’s the solution? Please help, and thanks.

[Tue Dec 07 03:40:49 2010] [error] [client 66.249.69.49] PHP Warning: htmlspecialchars() [
function.htmlspecialchars]: Invalid multibyte sequence in argument in /var/www/web1/web/wp-content/plugins/headspace2/plugi
n.php on line 547
[Tue Dec 07 03:46:31 2010] [error] [client 66.249.69.49] PHP Warning: htmlspecialchars() [
function.htmlspecialchars]: Invalid multibyte sequence in argument in /var/www/web1/web/wp-content/plugins/headspace2/plugi
n.php on line 547
[Tue Dec 07 03:51:28 2010] [error] [client 130.36.62.223] (70007)The timeout specified has expired: ap_content_length_filter: a
pr_bucket_read() failed, referer: http://www.funnewsblog.com/blog/tag/men-fashion
[Tue Dec 07 03:51:31 2010] [error] [client 130.36.62.223] (70007)The timeout specified has expired: ap_content_length_filter: a
pr_bucket_read() failed, referer: http://www.funnewsblog.com/blog/tag/men-fashion
[Tue Dec 07 03:52:20 2010] [error] [client 130.36.62.223] (70007)The timeout specified has expired: ap_content_length_filter: a
pr_bucket_read() failed, referer: http://www.funnewsblog.com/blog/tag/men-fashion

http://wordpress.org/extend/plugins/headspace2/