Error 0x80310011

Value: -2144272367 | 0x80310011 | 2150694929

What does it mean ?

FVE_E_TOO_SMALL  
The drive cannot be encrypted because it does not have enough free space. Delete any unnecessary data on the drive to create additional free space and then try again.
Value: 17 | 0x0011 | 0b0000000000010001

Where does it come from ?

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

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