Upgrade Problem in RC3

When pointing my browser to upgrade.php after uploading all of the RC3 files, I get the following errors:

WordPress database error: [Table ‘rprins_wordpress.wp_usermeta’ doesn’t exist]
SELECT meta_key, meta_value FROM wp_usermeta WHERE user_id = ‘1’

Warning: Cannot modify header information – headers already sent by (output started at /home/.sacko/rprins/lazyi.net/wp-includes/wp-db.php:102) in /home/.sacko/rprins/lazyi.net/wp-admin/upgrade.php on line 10

I am currently running 1.5.2. I saw that somebody else had this problem, but it was buried in an unrelated thread, and I thought I would open this one to give it more visibility. If you have any ideas, I’d love to hear them.

Thanks!