Error 0x80045028

Value: -2147200984 | 0x80045028 | 2147766312

What does it mean ?

SPERR_INSTANCE_CHANGE_INVALID  
It is not possible to change the current engine or input. This occurs in the following cases: 1) SelectEngine called while a recognition context exists, or 2) SetInput called in the shared instance case.
Value: 20520 | 0x5028 | 0b0101000000101000

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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