Error 0x80310039

Value: -2144272327 | 0x80310039 | 2150694969

What does it mean ?

FVE_E_NOT_DECRYPTED  
The drive must be fully decrypted to complete this operation.
Value: 57 | 0x0039 | 0b0000000000111001

Where does it come from ?

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

Other Errors for FACILITY_FVE