Error 0xC00D521A

Value: -1072868838 | 0xC00D521A | 3222098458

What does it mean ?

MF_E_TOPO_MISSING_SOURCE  
A source stream node in the topology does not have a source.
Value: 21018 | 0x521A | 0b0101001000011010

Where does it come from ?

FACILITY_MEDIASERVER  
Windows Media Server
Value: 13 | 0x00D | 0b00001101

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