Chronoform - You are not allowed to access this URL directly, POST array is empty [Solved]

This issue occurred due to some users access site with and without "www" site url 

Check Form action url:
<form name="ChronoContact_Renewal" id="ChronoContact_Renewal" method="post" action="http://website.com/index.php?option=com_chronocontact&task=send&chronoformname=ExamApply&Itemid=119" >

Default Form action url:
http://website.com/index.php?option=com_chronocontact&task=send&chronoformname=ExamApply&Itemid=119


Need to change the Form action url:
index.php?option=com_chronocontact&task=send&chronoformname=ExamApply&Itemid=119

Place the above url in 
Chronoform >>> Forms Managements >>> General  >>> Form submit url

<form name="ChronoContact_Renewal" id="ChronoContact_Renewal" method="post" action="index.php?option=com_chronocontact&task=send&chronoformname=ExamApply&Itemid=119" >