Enabling module in Drush errors

Hi,

Thanks for the work on this module, I stumbled into an error when enabling this module through drush. I'm not a developer so not too sure whats going on here. However the module did enable successfully.

drush en pathauto_paths 
The following extensions will be enabled: pathauto_paths
Do you really want to continue? (y/n): y
WD php: PDOException: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes: CREATE TABLE {pathauto_paths} (                                 [error]
`id` INT unsigned NOT NULL auto_increment COMMENT 'TODO: please describe this field!', 
`router_path` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`entity_type` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`bundle` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`pattern` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`language` VARCHAR(12) NULL DEFAULT NULL COMMENT 'TODO: please describe this field!', 
PRIMARY KEY (`id`), 
UNIQUE KEY `router_path` (`router_path`, `entity_type`, `bundle`, `language`)
) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COMMENT 'TODO: please describe this table!'; Array
(
)
 in db_create_table() (line 2688 of /home/e-smith/files/ibays/sota3/html/includes/database/database.inc).
Cannot modify header information - headers already sent by (output started at /usr/share/pear/drush/includes/output.inc:37) bootstrap.inc:1239                                                          [warning]
PDOException: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes: CREATE TABLE {pathauto_paths} (
`id` INT unsigned NOT NULL auto_increment COMMENT 'TODO: please describe this field!', 
`router_path` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`entity_type` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`bundle` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`pattern` VARCHAR(255) NOT NULL COMMENT 'TODO: please describe this field!', 
`language` VARCHAR(12) NULL DEFAULT NULL COMMENT 'TODO: please describe this field!', 
PRIMARY KEY (`id`), 
UNIQUE KEY `router_path` (`router_path`, `entity_type`, `bundle`, `language`)
) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COMMENT 'TODO: please describe this table!'; Array
(
)
 in db_create_table() (line 2688 of /home/e-smith/files/ibays/sota3/html/includes/database/database.inc).
Drush command terminated abnormally due to an unrecoverable error.