2checkout problem !!!

Anyone here use 2checkout to allow clients to pay by credit carrd ??? I tried a registration from autopilot script and when I'm going at step_four.php, I got the error msg:

Parameter Error.


Incorrect parameters were supplied therefore this purchase cannot begin.

If you are attempting to purchase from a web site please contact the web site so that they can correct the error.

If you are designing your web site consult the 2Checkout.com Admin Area for the proper codes.

Thank You,
2Checkout.com Inc.


I tried to determine what's wrong but can't find it. Help would be appreciate.

 

 

 

 

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