Error 0x8878121A

Value: -2005396966 | 0x8878121A | 2289570330

What does it mean ?

DMUS_E_SCRIPT_VARIABLE_NOT_FOUND  
The script does not contain a variable with the specified name.
Value: 4634 | 0x121A | 0b0001001000011010

Where does it come from ?

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

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