Ошибка не могу создать таблицу в базе данных
 

SQL : CREATE TABLE phpbb_config ( config_name varchar(255) DEFAULT '' NOT NULL, config_value varchar(255) DEFAULT '' NOT NULL, is_dynamic tinyint(1) UNSIGNED DEFAULT '0' NOT NULL, PRIMARY KEY (config_name), KEY is_dynamic (is_dynamic) ) CHARACTER SET `utf8` COLLATE `utf8_bin`Specified key was too long; max key length is 767 bytes