TOPIC: Paypal Error Message

Hi Everyone

I use the latest DTRegister (2.6.6) and Joomla 1.5. In some instances, when users are register and try to pay via Paypal, they receive the below error message on the Paypal site.

Did some research on the internet and one reason for this could be that wrong parameter are passed on to Paypal.

Has anyone else had this issue and may be solved it?

The event is online so it's really urgent.

Many thanks
Thomas

PAYPAL ERROR MESSAGE:
"If you were making a purchase or sending money, we recommend that you check both your PayPal account and your email for a transaction confirmation after 30 minutes.

If you came to this page from another website, please return to that site (don't use your browser's Back button) and try again.

If you came from PayPal's website, click the PayPal logo in the upper-left-hand corner to return to the home page and try again. You might have to log in again.
"