Error 0x803100A8

Value: -2144272216 | 0x803100A8 | 2150695080

What does it mean ?

FVE_E_NO_EXISTING_PASSPHRASE  
This drive isn't protected with a password.
Value: 168 | 0x00A8 | 0b0000000010101000

Where does it come from ?

FACILITY_FVE  
Full volume encryption
Value: 49 | 0x031 | 0b00110001

Other Errors for FACILITY_FVE