Error 0x80420100

Value: -2143158016 | 0x80420100 | 2151809280

What does it mean ?

EAP_E_USER_CERT_NOT_FOUND  
The EAPHost could not find the user certificate for authentication.
Value: 256 | 0x0100 | 0b0000000100000000

Where does it come from ?

FACILITY_EAP  
Extensible Authentication Protocol
Value: 66 | 0x042 | 0b01000010

Other Errors for FACILITY_EAP