Error 0x80045051

Value: -2147200943 | 0x80045051 | 2147766353

What does it mean ?

SPERR_REMOTE_PROCESS_ALREADY_RUNNING  
The remote process is already running; it cannot be started a second time.
Value: 20561 | 0x5051 | 0b0101000001010001

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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