checkout error message?

[carvolution]

hi everyone,

everything was working fine until i installed paypay addon fo the web payments pro. and now if you click on either the CHECKOUT or the PAY WITH PAYPAL itcon i get this message:

 

Fatal error: Call to undefined function: link_post_variable() in /home/nas03l/c/carvolution-security.com/user/htdocs/catalog/includes/classes/order.php on line 27

 

 

anyone know how to resolve this one please?

 

thanks