WP 2.7 Upgrade – Fatal error – Call to undefined function wp_clone()

I upgraded to 2.7 using the automatic upgrade in the administration area. There was an error that I didn’t end up recording during the portion where it was updating, but now I cannot log into the admin section because it shows this error:

Fatal error: Call to undefined function wp_clone() in /mnt/w0114/d31/s41/b02dfa4d/www/lochuuho.com/blog/wp-includes/cache.php on line 380

Could someone please help me out with this problem or redirect me in the right direction?