Update to 4.7 errors

Hi.

I'm new to drupal, used 4.6.5 and then followed the upgrade guide and video to 4.7. When I reload the page, I see the text below but don't know what it means. Any ideas ?

--------------------
user warning: Unknown column 'weight' in 'order clause' query: SELECT name, filename, throttle, bootstrap FROM system WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC in /var/www/html/drupal/includes/database.mysql.inc on line 120.
user warning: Unknown column 'referer' in 'field list' query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'page not found', 'node not found.', 1, '', 'http://localhost/drupal/', 'http://localhost/drupal/?q=user/1', '127.0.0.1', 1147627588) in /var/www/html/drupal/includes/database.mysql.inc on line 120.
2