Fatal Error In Donation

When moving from form to and pressing the process button and transferring to PayPal, I am getting this Fatal Error. Any thoughts from anyone.'
Fatal error: Call to a member function checkAnswer() on a non-object in /home/urbanlig/public_html/components/com_jdonation/controller/donation.php on line 26

Thanks

Hi,
This question has been answered through Ticket system
Thanks
Dam