Sage Pay error

Hello.

Website www.glorywatchcompany.co.uk
Hikashop version - 1.5.6

I have installed the latest version to get Sage Pay. The Sage Pay plug in has been configured with my Vendor name and password. I can select Sage Pay on the Payment methods on the checkout and click next. This is where the problems occure.

Attached are 3 screen shots.
1- Sage Pay Hikashop settings (user name and password starred out)
2- An error that quickly flashes on and off when I click "next" on the checkout to pay for the items. (Glory Error Message)
3- The error message from SAGE. (Sage Error Message).

I can set up a test account if you need it.

Thanks
John