Error 0x8004231D

Value: -2147212515 | 0x8004231D | 2147754781

What does it mean ?

VSS_E_VOLUME_IN_USE  
The specified shadow copy storage association is in use and so can't be deleted.
Value: 8989 | 0x231D | 0b0010001100011101

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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