Ошибка при установке tickets 1.13.0 pl. MySQL 5.6, PHP 7.1, MODX Revolution 2.8.1-pl

Подскажите, кто сталкивался, как вылечить?

Could not create table `xuy_tickets_mail_queues` SQL: CREATE TABLE `xuy_tickets_mail_queues` (`id` INTEGER unsigned NOT NULL AUTO_INCREMENT, `timestamp` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, `uid` INT(10) unsigned NOT NULL DEFAULT '0', `subject` VARCHAR(255) NULL DEFAULT '', `body` TEXT NULL, `email` VARCHAR(255) NULL DEFAULT '', PRIMARY KEY (`id`), INDEX `uid` (`uid`), INDEX `email` (`email`)) ENGINE=InnoDB ERROR: Array ( [0] => HY000 [1] => 1709 [2] => Index column size too large. The maximum column size is 767 bytes. )