Error 0xC00D520E

Value: -1072868850 | 0xC00D520E | 3222098446

What does it mean ?

MF_E_TOPO_INVALID_OPTIONAL_NODE  
The topology contains an invalid optional node. Possible reasons are an incorrect number of outputs and inputs or an optional node is at the beginning or end of a segment.
Value: 21006 | 0x520E | 0b0101001000001110

Where does it come from ?

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

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