Error 0x803100B5

Value: -2144272203 | 0x803100B5 | 2150695093

What does it mean ?

FVE_E_NO_PREBOOT_KEYBOARD_DETECTED  
No pre-boot keyboard detected. The user may not be able to provide required input to unlock the volume.
Value: 181 | 0x00B5 | 0b0000000010110101

Where does it come from ?

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

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