How do you enable guest checkout as another option?

[buster155]

Hello

 

I am having problems whereby it appears according to paypal guest shoppers are unable to checkout using paypal. However, I do not seem to have a guest checkout option but I keep getting paypal error messages

 

Hi,   Error reporting from your PayPalAPI module   A client has encountered a problem with the module PayPalAPI, see the report:   PayPal response:
TIMESTAMP -> 2014-01-11T18:22:57Z
L_ERRORCODE0 -> 10472
L_SHORTMESSAGE0 -> Transaction refused because of an invalid argument. See additional error messages for details.
L_LONGMESSAGE0 -> CancelURL is invalid.
L_SEVERITYCODE0 -> Error

 

If they are a registered than their sale goes through ok.

 

As I am new to Prestashop, any help would be appreciated.

 

Thanks

 

Buster155