Error 0x8004502A

Value: -2147200982 | 0x8004502A | 2147766314

What does it mean ?

SPERR_NO_RULES  
A grammar contains no top-level, dynamic, or exported rules. There is no possible way to activate or otherwise use any rule in this grammar.
Value: 20522 | 0x502A | 0b0101000000101010

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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