Error on emailing form

After insatlling Chrono forms 3.0 stable on a Joomla! 1.5.7 site and setting up a from and an email send I have recieved the fatal error below when I try to send.
Fatal error: Call to undefined method JRequest::checktoken() in /home/extramil/public_html/components/com_chronocontact/chronocontact.php on line 115
Has anyone had this before and how did you resolve the issue?

Phil Clucas

Hi Phil,

try to open this file at your system :
components/com_chronocontact/chronocontact.php
and find this line :

JRequest::checktoken()

and make it :

JRequest::checkToken()

let me know if it will get fixed ?