Error 0x80310028

Value: -2144272344 | 0x80310028 | 2150694952

What does it mean ?

FVE_E_NOT_OS_VOLUME  
The drive specified is not the operating system drive.
Value: 40 | 0x0028 | 0b0000000000101000

Where does it come from ?

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

Other Errors for FACILITY_FVE