Null error when attempting to issue a credit

[BobD]

HI

When I attempt to issue a credit for transaction 35724-2012061444300182890 it shows an error
null---(3501)

Is this in your court or mine?

[CnP.LiveSupport.AB]

Hi BobD, This transaction was processed by TransFirst before the account was migrated to ProPay. As such, the only way to issue a refund is for your organization to pay the registrant directly.