What's the URL of the page that you're using it on that's giving that many errors? I use that plugin on most of the sites that I manage, and I haven't found anything like that number of errors on any of them before, os I'd be interested to see exactly what the errors are.
As a general opinion on that plugin, I think it does it's job well. It's regularly udpated and really does a good job of controlling the SEO for your site.