arkadaşlar forum siteme video eklediğim zaman bu hata ile karşılaşıyorum nedeni ne olabilir

Genel Hata
SQL ERROR [ mysql4 ]

The used table type doesn't support FULLTEXT indexes [1214]

SQL

SELECT f.forum_id, f.forum_name, t.topic_id, t.topic_title, t.topic_replies, t.topic_last_post_time, t.topic_last_post_id, u.user_id, u.username, u.user_colour FROM phpbb_topics t, phpbb_users u, phpbb_forums f WHERE MATCH (t.topic_title) AGAINST ('fghfgh' IN BOOLEAN MODE) AND f.forum_id = t.forum_id AND u.user_id = t.topic_poster AND t.topic_id <> 17 GROUP BY t.topic_id LIMIT 5

BACKTRACE


FILE: includes/db/mysql.php
LINE: 158
CALL: dbal_mysql->sql_error()

FILE: includes/db/mysql.php
LINE: 205
CALL: dbal_mysql->sql_query()

FILE: includes/db/dbal.php
LINE: 153
CALL: dbal_mysql->_sql_query_limit()

FILE: viewtopic.php
LINE: 1670
CALL: dbal_mysql->sql_query_limit()