Can't open self created articles/contacts

Hi...
on the www.tuktuktimbul.eu I can't open articles that I've created on my own.
Once clicking on the related menu link it displays:

Not Found

The requested URL /2012-11-07-13-25-10/about-us was not found on this server.

But the article is there, it can be edited....

Any idea?

Cheers

Got it...it was the SEO setting... uuups