Data - Error Message - Value-missing

here for a quick overview of the site jquery validation engine custom error message Help Center Detailed answers to any questions you might html5 form validation error message have Meta Discuss the workings and policies of this site About Us Learn more jquery setcustomvalidity about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users html5 validation Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Unable to specify custom error in jQuery validation engine up vote 3 down vote favorite 2 I am fiddling with the jQuery validation engine documented here I have downloaded all JS files locally. And created a simple form with single required textbox field. Problem 1 I am unable to specify custom error for this required rule (even though I have specified custom-error-message option). Instead it shows the default message "This field is required." I have written this code with the help of example (shown here) on the git, but it is not working. Please point out where it is going wrong. (I want to do it with JS object literals instead of using equivalent html5 attributes.) My code: