If this is in a form:

<input class="required" type="text"/>

and the form is validated with:

jQuery("#demo_form").validate({meta:"validate"}); inside $.ready

Then I get this :

meta is undefined

file:/C:/Development/Assets/test/datetime/jquery.validate.js

Line 507

Which is caused by this:

return meta.messages && meta.messages[method];

I think this is a new function in the 1.4 script but I think it should

check for !meta before calling 'meta.messages' :

if(!meta){ return; }

This fixes the bug