Error 0x80040D41

Value: -2147218111 | 0x80040D41 | 2147749185

What does it mean ?

GTHR_E_USER_AGENT_NOT_SPECIFIED  
The user agent string was not specified or contains invalid characters. Specify a user agent which is not empty and does not contain double quotation marks.
Value: 3393 | 0x0D41 | 0b0000110101000001

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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