Error 0x8DC70002

Value: -1916338174 | 0x8DC70002 | 2378629122

What does it mean ?

E_JsDEBUG_UNKNOWN_THREAD  
Thread is not known to have any JS code, and will have no frames.
Value: 2 | 0x0002 | 0b0000000000000010

Where does it come from ?

FACILITY_JsDEBUG  
Javascript Debugger
Value: 3527 | 0xDC7 | 0b110111000111

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