Allahabad Bank int Debit Cum ATM card
Can not use it online

I HAVE AN ATM CUM DEBIT CARD, BUT IT DOES NOT WORKING AS A DEBIT CARD, WHEN MADE A TRANSACTION ON LINE IT GIVES AN ERROR "This debit/credit card has been denied by the bank that issued your debit/credit card. For details on why your card was denied, please contact your debit/credit card issuer's customer service department. Or, you may want to try adding a different debit/credit card".