Error 0x8004501E

Value: -2147200994 | 0x8004501E | 2147766302

What does it mean ?

SPERR_GRAMMAR_COMPILER_INTERNAL_ERROR  
The grammar compiler failed due to an internal state error.
Value: 20510 | 0x501E | 0b0101000000011110

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

Other Errors for FACILITY_ITF