10550 Invalid Configuration - This transaction cannot be processed

Hi all,
I had just installed zen cart 1.38 and was testing the payment modules for both pp express cart and pp website payments pro. PP website payments pro gave me this error "10550 Invalid Configuration - This transaction cannot be processed" and the error email header was "ALERT: PayPal Direct Payment Error (10550 <!-- -->)". I tried searching this forum for the meaning of this error but found none. Appreciate some help here to guide me what went wrong, thanks in advance!

10550 means: > Access to Direct Payment was disabled

for your account. Contact PayPal for
more information.

Sounds like you need to contact PayPal customer service, or your PayPal account rep.

Hi DrByte,

Thanksfor the reply. Do I need to quote them these error messages?:

10550 Invalid Configuration - This transaction cannot be processed

AND

ALERT: PayPal Direct Payment Error (10550 <!-- -->)