vz28bh/CakePHP-JqueryValidationHelper — pull request #2 by aymanrb (2013-12-01 16:26:41+00:00)
Title: Replaced the Metadata Jquery Plugin Usage with new 'data-' tags

According to the JQuery Validation Plugin github's page ... it has dropped support for metadata plugin and replaced it with HTML5 tags - http://goo.gl/AY6omU

It seems like the code used to work with you since you are relying on an outdated version of the plugin. Reference to this issue (https://github.com/vz28bh/CakePHP-JqueryValidationHelper/issues/1) please accept this pull request.

And thanks for this amazing helper :) !