Error 0x8031004A

Value: -2144272310 | 0x8031004A | 2150694986

What does it mean ?

FVE_E_NOT_ON_STACK  
BitLocker Drive Encryption cannot be used because critical BitLocker system files are missing or corrupted. Use Windows Startup Repair to restore these files to your computer.
Value: 74 | 0x004A | 0b0000000001001010

Where does it come from ?

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

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