Error 0x80100017

Value: -2146435049 | 0x80100017 | 2148532247

What does it mean ?

SCARD_E_READER_UNAVAILABLE  
The specified reader is not currently available for use.
Value: 23 | 0x0017 | 0b0000000000010111

Where does it come from ?

FACILITY_SCARD  
Smart-card subsystem
Value: 16 | 0x010 | 0b00010000

Other Errors for FACILITY_SCARD