if(jqXHR.status == 400){
            errors = jqXHR.responseJSON;

            if(errors != null && errors.length>0){
                for(var er in errors){
                    var theError = errors[er];
                    if(theError.field!=null){
                        addError($("#"+formId + " [name='"+theError.field+"']")[0], theError.defaultMessage);
...