404 crawl errors google webmaster tools

Hi,

I never saw this kind of URL structure in WordPress…
I know http://www.your-site-com/tag/tag-example
or http://www.your-site-com/category/cat-example
but not http://www.your-site-com/tag/tag-example/cat-example ! It doesn’t make sense.
That’s perhaps you get 404 error !

What’s the behavior when you go to http://www.your-site-com/category/%category_name% ?

In Google Webmaster Tools, go to “URL Parameters” and look for a wrong parameter.
Then, you can’t remove it, but you will be able to modify it to allow the Google Crawlers to crawl or not the matching URL structure. There are many option for you.

You should read this