Error 0x801F0008

Value: -2145452024 | 0x801F0008 | 2149515272

What does it mean ?

ERROR_FLT_FILTER_NOT_READY  
The filter is not ready for attachment to volumes because it has not finished initializing (FltStartFiltering has not been called).
Value: 8 | 0x0008 | 0b0000000000001000

Where does it come from ?

FACILITY_USERMODE_FILTER_MANAGER  
User Mode Filter Manager
Value: 31 | 0x01F | 0b00011111

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