Problem second page of category

Good afternoon,

I’m running wordpres 3.0.5 at my website,
With the theme “Polished” from elegant themes.
Only i have a problem when i’m navigate to the “older entries” in a category, it′s says
“The page you requested could not be found. Try refining your search, or use the navigation above to locate the post.”

you can see the error live @ https://tinyurl.com/4ttbwvg

For example, klick on the “blogg” button, scroll down, and hit the “older entries” button you will see that i’m getting the error i showed your guys above.

Does anyone know what it properly can be.

Reguards,