PDF attached invoice give an error on confirming

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.2
-- PHP version -- : 7
-- Error-message(debug-mod must be tuned on) -- : An error has occured

Hi Hikashop team,

When I use the PDF invoice plugin and I confirm a order on the back-end after the did a bank transfer I get this error.



When I turn of the plugin the problem is gone.

Can you please help me to fix this issue.

Kind regards,
Lumiga

I fixed it to download the latest version of the plugin.

Sorry for your time!