Error 0x8031001B

Value: -2144272357 | 0x8031001B | 2150694939

What does it mean ?

FVE_E_CONV_READ  
A read operation failed while converting the drive. The drive was not converted. Please re-enable BitLocker.
Value: 27 | 0x001B | 0b0000000000011011

Where does it come from ?

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

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