Error 0x80045023

Value: -2147200989 | 0x80045023 | 2147766307

What does it mean ?

SPERR_CIRCULAR_REFERENCE  
Circular reference in import rules of grammars.
Value: 20515 | 0x5023 | 0b0101000000100011

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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