Error 0x80310029

Value: -2144272343 | 0x80310029 | 2150694953

What does it mean ?

FVE_E_AUTOUNLOCK_ENABLED  
BitLocker Drive Encryption cannot be turned off on the operating system drive until the auto unlock feature has been disabled for the fixed data drives and removable data drives associated with this computer.
Value: 41 | 0x0029 | 0b0000000000101001

Where does it come from ?

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

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