Opencart 1.5.6.4 / journal 2 theme / TWS Payment gateway

Hi, we are in the process of moving from paypoint secpay that seems to have a number of problems with its integration to Total Web Solutions payment gateway. We have however come across an error when coming to edit the plugin once installed. It errors with the below, which



Which refers to these lines below;



HAs anyone seen this before, maybe has a fix for it ? I have fired of a mail to the support team at TWS but thought it maybe worthwhile checking here too. Thanks