Sendex

почему в sendex на хостинге теперь так получается при установке плагина
Could not create table `modx_sendex_subscribers` SQL: CREATE TABLE `modx_sendex_subscribers` (`id` INTEGER unsigned NOT NULL AUTO_INCREMENT, `newsletter_id` INT(10) unsigned NOT NULL DEFAULT '0', `user_id` INT(10) unsigned NULL DEFAULT '0', `email` VARCHAR(255) NULL DEFAULT '', `code` CHAR(40) NULL DEFAULT '', PRIMARY KEY (`id`), UNIQUE KEY `key` (`newsletter_id`,`user_id`,`email`), UNIQUE KEY `code` (`code`)) ENGINE=MyISAM ERROR: Array ( [0] => 42000 [1] => 1071 [2] => Specified key was too long; max key length is 1000 bytes )