Google 4xx errors

vBSEO Sitemap Generator v1.7

Google is reporting these errors in my sitemap_1.xml.gz file.

1. Parsing error (Line 14)
2. Invalid URL (Line 14)

I clicked on Google's diagnostic page to see what Google is complaining about and found a group of HTTP errors. Specifically 4xx errors for some 830 single post pages. Google lists all the URLs in question so I clicked on many of them, and they do in fact exist. Why are they listed as HTTP errors and more importantly how do I correct this with Google?

Hello,

Google is reporting these errors in my sitemap_1.xml.gz file.

1. Parsing error (Line 14)
2. Invalid URL (Line 14)

As I see, you have the URLs like "/store/cart.php" included in sitemap, while your vBulletin is located in forums/ folder.
In this case you should submit all sitemap files manually to google webmaster account at the root of your site, as described here: Sitemap in www root

I clicked on Google's diagnostic page to see what Google is complaining about and found a group of HTTP errors. Specifically 4xx errors for some 830 single post pages. Google lists all the URLs in question so I clicked on many of them, and they do in fact exist. Why are they listed as HTTP errors and more importantly how do I correct this with Google?

Perhaps your site was temporarily not available when google bot tried to reach these pages.