Error 0x8004503E

Value: -2147200962 | 0x8004503E | 2147766334

What does it mean ?

SPERR_NOT_DYNAMIC_GRAMMAR  
Attempt was made to manipulate a non-dynamic grammar.
Value: 20542 | 0x503E | 0b0101000000111110

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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