Error 0x8878121C

Value: -2005396964 | 0x8878121C | 2289570332

What does it mean ?

DMUS_E_SCRIPT_CONTENT_READONLY  
Attempted to set variables for content referenced or embedded in a script.
Value: 4636 | 0x121C | 0b0001001000011100

Where does it come from ?

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

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