javax.smartcardio.CardException: connect() failed

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sun.security.smartcardio.PCSCException: SCARD_W_UNPOWERED_CARD
at sun.security.smartcardio.PCSC.SCardConnect(Native Method)
at sun.security.smartcardio.CardImpl.(CardImpl.java:96)
at rfidreadtest.RFIDReadTest.handleCard(RFIDReadTest.java:54)
at rfidreadtest.RFIDReadTest.main(RFIDReadTest.java:42)

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