errore mysql

[bancoprova]

errore mysql

ciao a tutti
mi da questo errore quando faccio trova utenti.
suggerimenti?

SQL ERROR [ mysql4 ]

Got error 134 from storage engine [1030]

SQL

SELECT u.user_id 			FROM phpbb_users u 				 			WHERE u.user_type IN (0, 3) 				 			ORDER BY u.user_regdate ASC  LIMIT 50

BACKTRACE

FILE: includes/db/mysql.php
LINE: 174
CALL: dbal_mysql->sql_error()

FILE: includes/db/mysql.php
LINE: 221
CALL: dbal_mysql->sql_query()

FILE: includes/db/dbal.php
LINE: 170
CALL: dbal_mysql->_sql_query_limit()

FILE: memberlist.php
LINE: 1364
CALL: dbal_mysql->sql_query_limit()