Freeradius 2 with mysql setting ,cannot start by the as error,

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Connected new DB handle, #4

Wed Jun  9 09:38:56 2010 : Error: rlm_sql (sql): database query error, SELECT id, nasname, shortname, type, secret, server FROM nas: Unknown column 'server' in 'field list'

Wed Jun  9 09:38:56 2010 : Error: Failed to load clients from SQL.

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Closing sqlsocket 4

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Closing sqlsocket 3

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Closing sqlsocket 2

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Closing sqlsocket 1

Wed Jun  9 09:38:56 2010 : Info: rlm_sql (sql): Closing sqlsocket 0

Wed Jun  9 09:38:56 2010 : Error: /etc/freeradius/sql.conf[22]: Instantiation failed for module "sql"

Wed Jun  9 09:38:56 2010 : Error: /etc/freeradius/sites-enabled/default[159]: Failed to load module "sql".

Wed Jun  9 09:38:56 2010 : Error: /etc/freeradius/sites-enabled/default[62]: Errors parsing authorize section.

Wed Jun  9 09:38:56 2010 : Error: Failed to load virtual server <default>

mysql> ALTER TABLE `radius`.`nas` ADD COLUMN `server` VARCHAR(45) NOT NULL AFTER `secret` ;