about.php can not be found

Hi!

My WordPress cannot find any of my created pages About, Archives or Contact from the main menu, but it can be found from the “Pages”-menu. Why is that? When I look at my code I can see that it tries to find it, but I only get an Error page… I have translated it manually to Swedish.

This is the code:

<li><a href="<?php bloginfo('url'); ?>">Hem</a></li>
					<li><a href="<?php bloginfo('url'); ?>/archives">Arkiv</a></li>
					<li><a href="<?php bloginfo('url'); ?>/about">Om Sara</a></li>
					<li><a href="<?php bloginfo('url'); ?>/contact">Kontakt</a></li>