upgrade fails badly in CVS version

I want to help testing 4.7. I retrieved CVS set up settings file, went to update.php

please give some hint on how to resolve this

Fatal error: Unknown column 'referer' in 'field list' query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Table \'drupal.node_revisions\' doesn\'t exist\nquery: SELECT DISTINCT(n.nid), n.vid, n.type, n.status, n.created, n.changed, n.comment, n.promote, n.moderate, n.sticky, r.timestamp AS revision_timestamp, r.title, r.body, r.teaser, r.log, r.format, u.uid, u.name, u.picture, u.data FROM node n INNER JOIN users u ON u.uid = n.uid INNER JOIN node_revisions r ON r.vid = n.vid WHERE n.nid = 1100 in /Users/bwynants/Sites/4.7/drupal/includes/database.mysql.inc op lijn 108.', 2, '', '/4.7/drupal/', '', '192.168.1.4', 1132579392) in /Users/bwynants/Sites/4.7/drupal/includes/database.mysql.inc on line 108

Notice: Undefined property: stdClass::$cache in /Users/bwynants/Sites/4.7/drupal/includes/session.inc on line 45

Fatal error: Unknown column 'cache' in 'field list' query: UPDATE sessions SET uid = 1, cache = 0, hostname = '192.168.1.4', session = 'messages|a:0:{}watchdog_overview_filter|s:3:\"all\";', timestamp = 1132579392 WHERE sid = 'n8akar6ta0ps1ddte3a2oie6u3' in /Users/bwynants/Sites/4.7/drupal/includes/database.mysql.inc on line 108

Warning: Unknown: A session is active. You cannot change the session module's ini settings at this time. in Unknown on line 0

Warning: Unknown: A session is active. You cannot change the session module's ini settings at this time. in Unknown on line 0