The 404 URL was /wordpress/plugin/local-seo/ (it lacks an s after plugin)
It was linked to from our WordPress SEO article.
Using this info, you can fix the 404 and actually also go into the article and fix the link.
As you can see from the above screenshot, we actually get 404s too. We break things all the time because our website is a constant work in progress. I don’t think anyone can totally prevent creating 404 errors on his or her site. Making sure that you notice it when you’re breaking things is a good way of not looking stupid for too long though.
Measuring bot 404 error pages
Next to 404s for visitors, search engines will also encounter 404s on your site that can be quite different.You can find the 404s that search engine spiders encounter by logging into their respective Webmaster Tools programs. There are three webmaster tools programs that can give you indexation reports, in which they tell you which 404s they encountered:
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