Board.board what is this?

Hi OpenERP Team

Can anybody tell me what's going on this error?
And how to fix it? Thanks so much !

[2012-03-27 14:18:56,586][dbtest] ERROR:db.cursor:Programming error: column board_board.default_code does not exist
LINE 1: SELECT "board_board".id FROM "board_board" WHERE (board_boar...
                                                          ^
, in query SELECT "board_board".id FROM "board_board" WHERE (board_board.default_code ilike 'P0026') ORDER BY id
[2012-03-27 14:18:56,586][dbtest] ERROR:web-services:Uncaught exception
Traceback (most recent call last):
  File "osv\osv.pyo", line 122, in wrapper
  File "osv\osv.pyo", line 176, in execute
  File "osv\osv.pyo", line 167, in execute_cr
  File "osv\orm.pyo", line 1745, in search
  File "osv\orm.pyo", line 4027, in _search
  File "sql_db.pyo", line 78, in wrapper
  File "sql_db.pyo", line 131, in execute
ProgrammingError: column board_board.default_code does not exist
LINE 1: SELECT "board_board".id FROM "board_board" WHERE (board_boar...
                                                          ^
From John Chen