Cart can’t be loaded or an order has already been placed using this cart Error

[Jhorene]

Good day,

 

I've recently put in a payment module for Netcash and all seems to be working until I get transferred back to the site and I get this message on a white screen with an address bar full of information:

 

Cart can’t be loaded or an order has already been placed using this cart

 

When I go into the profile, the order and payment was accepted.

 

I am running PrestaShop version 1.4.4.0

 

Has anyone seen this before and have any advice for me please?

 

Thank you.

 

Regards,

Jhorene