Error 0x8031009E

Value: -2144272226 | 0x8031009E | 2150695070

What does it mean ?

FVE_E_REMOVAL_OF_NKP_FAILED  
Removal of the Network Key Protector certificate must be done using the Certificates snap-in.
Value: 158 | 0x009E | 0b0000000010011110

Where does it come from ?

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

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