False urls in sitemap error reports

Could you help explain their origin?

[Vadim]

Hello,
Google reports that three urls in my site give 404 error.

However I have no these URLs in my site pages and my sitemap.

I checked several times and find nothing.

All this URL looks like directories, for example
www.MySite.com/MyDir/something
where
www.MySite.com/MyDir/
exits but
www.MySite.com/MyDir/something
does not exist.

Could you give me a hint where does Google get them from? I did not find them even searching with link: in Google.

Thanks,
Vadim.

[Vadim]

Anybody here?

Please answer if you can.

This post probably was not noticed because never appeared on the first page.

It was pending for three days (I shoud have probably add some ** to the url to pass the auto filter).

Vadim.