Need help >>> What can I do with the "pages not found" in BO

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Version: 1.3.0.6

Back Office >> Stats >> Modules >>Pages not found

This module find lots of pages that can't be found on my shop. How can I deal with them ?

I did asthe guide tells :. htaccess
insert the following line inside: ErrorDocument 404 /404.php


But the line already exsits.

Google websmaster also find the losing pages.

How can I deal with them plz?