Error 0x80045027

Value: -2147200985 | 0x80045027 | 2147766311

What does it mean ?

SPERR_ALL_WORDS_OPTIONAL  
A grammar rule was defined with a null path through the rule. That is, it is possible to satisfy the rule conditions with no words.
Value: 20519 | 0x5027 | 0b0101000000100111

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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