OK Guys.
I have no idea what I changed that made it work, but I was also getting this error message.
Listed here are my settings that are working for me. So set your
secpay account to test account mode and input these options into your zen admin secpay module. Then you might want to change one thing at a time to see what breaks it.
Shame there is'nt more documentation on this for us all, but I hope this helps someone.
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Enable SECpay Module
True
Merchant ID
secpay
Digest Password
secpay
Remote Password
secpay
Transaction Currency
Default Currency
Transaction Mode
Always Successfull
Defer Mode
Default
CV2 Mode
Default
Payment Zone
United Kingdom
Set Order Status
Processing [2]
Sort order of display.
0
Template
http://www.secpay.com/users/template.html
Template background colour
#ffffff
Template Background Image
Template Branding
HedgeShop.co.uk
Template Font Colour
Template Font Face
Template Font Size
SECPay E-Mail Subject
SECPay E-Mail Message
Customer E-Mail Mode
Inline
Merchant E-Mail Mode
Inline
SECPay Customer E-Mail
True
SSL Callback
Non-SSL