Unknown column 'user_pass_convert' in 'field list' on update from phpBB 2

When trying to convert a phpBB2 forum to 3.1.0-RC3 I recieve the following error multiple times during the conversion:

[phpBB Debug] PHP Warning: in file [ROOT]/install/install_convert.php on line 2059: call_user_func_array() expects parameter 1 to be a valid callback, function 'phpbb_hash' not found or invalid function name

followed by many:

CODE: SELECT ALL
Fatal installation error
install_convert.php [ 1340 ]:
Error while processing INSERT query.
» SQL:INSERT IGNORE INTO phpbb_users (user_id, user_type, group_id, user_regdate, username, username_clean, user_password, user_pass_convert, user_posts, user_email, user_email_hash, user_birthday, user_lastvisit, user_lastmark, user_lang, user_timezone, user_dateformat, user_inactive_reason, user_inactive_time, user_jabber, user_rank, user_permissions, user_avatar, user_avatar_type, user_avatar_width, user_avatar_height, user_new_privmsg, user_unread_privmsg, user_last_privmsg, user_emailtime, user_notify, user_notify_pm, user_notify_type, user_allow_pm, user_allow_viewonline, user_allow_viewemail, user_actkey, user_newpasswd, user_style, user_options, user_sig_bbcode_uid, user_sig, user_sig_bbcode_bitfield) VALUES (4734, 0, 4227, '1300910258', 'Reamon', 'remon', '', 1, 1, 'erito_169@hotmail.com', '18584352326', ' 0- 0- 0', 1300910258, 1300910258, 'en', 'Etc/GMT-1', 'd F Y, G:i A', 0, 0, '', 0, '', '', 0, 0, 0, '0', 0, 1300911654, 0, 0, 1, 0, 1, 1, 0, '', '', '1', 230271, '1oc3d93z', '', 0)

Array ( [message] => Unknown column 'user_pass_convert' in 'field list' [code] => 1054 )

I can finish the conversion but end up with no users, except for the bots that come with the standard install.