How to fix comments/feed 404 error in wordpress

Today i logined into my google webmaster tool to find a crawl error of my blog. a url called comments/feed can not be found by google spider

Then i open this url in browser, i get this content.

I fix this problem by follow steps.

Step 1: Edit robots.txt of my website

I edited robots.txt file of my website to prohibit google spider to index html page in comments directory, if you can not how to edit robots.txt of wordpress, you can read

Step 2: Remove this url from google search result and index

I use google webmaster tool to remove this url from google search result and index, it is very easy, however, if you do not know to delete urls from google, you can read: