Google webmaster tools reports not found pages

Question

Hi, I have hundreds of crawling errors in webmaster tools, they are like that for example: http://www.acadclass.com/entities, where "entities" is a tag word.

But normaly when looking for a tag I should have this URL: http://www.acadclass.com/tag/entities

May it be a htaccess missconfiguration?

This is my htaccess:

DirectoryIndex index.php
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^(.*)//(.*)$
RewriteRule . %1/%2 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ index.php?qa-rewrite=$0&%{QUERY_STRING} [L]
</IfModule>

Comments

Strange. Does it tell you where the errors are coming from? It usually tells you which page is linking to the 404s.

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All pages having a keyword after the domain URL, like http://www.acadclass.com/tag

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No, what I mean is where are the links to those pages? In Webmaster Tools click the URL in the crawl errors page and there is a tab saying "Linked From". That should help you identify the problem.

Answer 1

I answer here instead of commenting because I cannot attach an image in the comments...

In reply to your comment: "No, what I mean is where are the links to those pages? In Webmaster Tools click the URL in the crawl errors page and there is a tab saying "Linked From". That should help you identify the problem."

I get that when I click the URL (introuvable means cannot be found...) No Linked From tab:

 

Comments

Strange, not sure why you wouldn't get that. Are those URLs listed anywhere, for example a sitemap?

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I dont think so. I use a plugin for the sitemap and there is nothing odd in the sitemap: http://www.acadclass.com/sitemap.xml