phpBB 3.0.1 RC1 Update General Error

Clicked the check files again button after replacing the new files. And got this general error:

SQL ERROR [ mysqli ]

Unknown column 'session_forum_id' in 'field list' [1054]

SQL

UPDATE phpbb_pg_sessions SET session_time = 1206566498, session_page = 'install/index.php?mode=update&sub=update_files', session_forum_id = 0 WHERE session_id = '3f33f94bdc5c542b6672e028089f95d5'

BACKTRACE

FILE: includes/db/mysqli.php
LINE: 143
CALL: dbal->sql_error()

FILE: includes/session.php
LINE: 316
CALL: dbal_mysqli->sql_query()

FILE: install/install_update.php
LINE: 117
CALL: session->session_begin()

FILE: install/index.php
LINE: 403
CALL: install_update->main()

FILE: install/index.php
LINE: 275
CALL: module->load()