Setup Paypal Website Payments Standard

Hi,
I've configured Paypal Sandbox. As per the instructions of the link below and the following error is given when I go through to "Pay Now".

Rapids::Exception (N6Rapids5Tools13PimpExceptionE): Pimp RC: 3514 Failure log: Use of pimp_rc (4814), Use of pimp_rc (3013), Use of pimp_rc (4814), Use of pimp_rc (3174), Use of pimp_rc (14816), Use of pimp_rc (9449), Use of pimp_rc (9445), Use of pimp_rc (4814), Use of pimp_rc (3507), Use of pimp_rc (4001), Use of pimp_rc (4002), Use of pimp_rc (3778), Use of pimp_rc (4007), Use of pimp_rc (4020), Use of pimp_rc (7003), Use of pimp_rc (3583), Use of pimp_rc (3051), Use of pimp_rc (3001), Use of pimp_rc (3021), Use of pimp_rc (3242), Use of pimp_rc (3165), Use of pimp_rc (3101), Use of pimp_rc (3085), Use of pimp_rc (3209), Use of pimp_rc (3174), Use of pimp_rc (3043), Use of pimp_rc (3241), Use of pimp_rc (3082), Use of pimp_rc (3129), Use of pimp_rc (3567), Use of p ...