Smarty : parameter 'field2' is not a valid date error

Hello

I use SmartyValidate add on/

I'm getting the error:

Notice: SmartyValidate: [isDateAfter] parameter 'field2' is not a
valid date. in C:\wamp\

Code:

{html_select_date prefix="startDate"}
{html_select_date prefix="endDate"}

{validate id="endDate" field="endDate" criteria="dummyValid"
transform="makeDate"}

{validate id="check" field="endDate" criteria="isDateOnOrAfter"
field2="startDate" transform="makeDate"}

input type="hidden" name="startDate'
input type="hidden" name="endDate"


php:

if(empty($_POST)) {

SmartyValidate::connect($smarty, true);
SmartyValidate::register_validator('endDate', 'EndDate', 'dummyValid',
false, false, 'makeDate');
SmartyValidate::register_validator('check', 'endDate', 'dummyValid',
false, false, 'makeDate');

} else {
SmartyValidate::connect($smarty);
if(SmartyValidate::is_valid($_POST)) {
SmartyValidate::disconnect();
$smarty->display('success.tpl');
} else {
$smarty->assign($_POST);

}
}

Please help me. I'm new in Smarty

Does "transform="makeDate"" attribut is not responsilbe to convert
'field2' in to date ?