Error 0x8004501D

Value: -2147200995 | 0x8004501D | 2147766301

What does it mean ?

SPERR_EMPTY_RULE  
A non-dynamic grammar rule that has no body.
Value: 20509 | 0x501D | 0b0101000000011101

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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