Error 0x80004029

Value: -2147467223 | 0x80004029 | 2147500073

What does it mean ?

CO_E_ASYNC_WORK_REJECTED  
The thread-pool rejected the submitted asynchronous work.
Value: 16425 | 0x4029 | 0b0100000000101001

Where does it come from ?

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

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Other Errors for FACILITY_NULL