wordpress 2 Install upgrade help

i did everything in the upgrade tutorial but when i go to https://www.design-parade.siahart.com/wp-admin/upgrade.php i get this:

Fatal error: Cannot redeclare user_can_create_post() (previously declared in /hsphere/local/home2/josiahp/design-parade.siahart.com/wp-includes/functions-post.php:335) in /hsphere/local/home2/josiahp/design-parade.siahart.com/wp-includes/capabilities.php on line 339

what does this mean? and what do i do to get my blog working again?

Thanks