Error 0x80310097

Value: -2144272233 | 0x80310097 | 2150695063

What does it mean ?

FVE_E_CANT_LOCK_AUTOUNLOCK_ENABLED_VOLUME  
The drive cannot be locked because it is automatically unlocked on this computer. Remove the automatic unlock protector to lock this drive.
Value: 151 | 0x0097 | 0b0000000010010111

Where does it come from ?

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

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