Error 0x80310040

Value: -2144272320 | 0x80310040 | 2150694976

What does it mean ?

FVE_E_NOT_ALLOWED_IN_SAFE_MODE  
The BitLocker configuration of the specified drive cannot be managed because this computer is currently operating in Safe Mode. While in Safe Mode, BitLocker Drive Encryption can only be used for recovery purposes.
Value: 64 | 0x0040 | 0b0000000001000000

Where does it come from ?

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

Other Errors for FACILITY_FVE