Getting PDOException when installing this module

Hi,

When installing this module I get this message:

PDOException: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long;
max key length is 767 bytes: ALTER TABLE {users} CHANGE `mail` `mail` VARCHAR(320)
NULL DEFAULT ''; Array ( ) in function db_change_field() (line 3020 in file /apps/drupal/htdocs/includes/database/database.inc)

Also same issue with previous version.

This might be problem with some other module maybe, but I have newest version of every module and Drupal 7.35 core.

Does anyone have similiar issues ?