i'm trying to verify my google sitemap and i get this error: We've detected that your 404 (file not found) error page returns a status of 200 (OK) in the header. is this bad for search engine optimization? should i set up my error pages some other way?
No. What Google is saying is that your site should be returning error 404 but instead is returning 200 ("OK"). http://sitemaps.blogspot.com/2005/09/verifying-your-site-trouble-with-404.html