Error 0x80040DAE

Value: -2147218002 | 0x80040DAE | 2147749294

What does it mean ?

GTHR_E_CANNOT_ENABLE_CHECKPOINT  
The checkpoint cannot be enabled, because the content index is not idle. Wait until the index is idle, and then try again.
Value: 3502 | 0x0DAE | 0b0000110110101110

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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