Error 0x8031002B

Value: -2144272341 | 0x8031002B | 2150694955

What does it mean ?

FVE_E_WRONG_SYSTEM_FS  
BitLocker Drive Encryption operating system drives must be formatted with the NTFS file system in order to be encrypted. Convert the drive to NTFS, and then turn on BitLocker.
Value: 43 | 0x002B | 0b0000000000101011

Where does it come from ?

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

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