Error 0x88781207

Value: -2005396985 | 0x88781207 | 2289570311

What does it mean ?

DMUS_E_CANNOT_CONVERT  
A call to MIDIToMusic() or MusicToMIDI() resulted in an error because the requested conversion could not happen. This usually occurs when the provided DMUS_CHORD_KEY structure has an invalid chord or scale pattern.
Value: 4615 | 0x1207 | 0b0001001000000111

Where does it come from ?

FACILITY_DIRECTMUSIC  
Direct Music (part of DirectX) - Audio
Value: 2168 | 0x878 | 0b100001111000

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