Error 0x80004012

Value: -2147467246 | 0x80004012 | 2147500050

What does it mean ?

CO_E_INIT_ONLY_SINGLE_THREADED  
There was an attempt to call CoInitialize a second time while single threaded
Value: 16402 | 0x4012 | 0b0100000000010010

Where does it come from ?

FACILITY_NULL  
The default facility code
Value: 0 | 0x000 | 0b00000000

StackOverflow

Other Errors for FACILITY_NULL