Error 0x80310001

Value: -2144272383 | 0x80310001 | 2150694913

What does it mean ?

FVE_E_NOT_ENCRYPTED  
This drive is not encrypted.
Value: 1 | 0x0001 | 0b0000000000000001

Where does it come from ?

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

Other Errors for FACILITY_FVE