what wrong with it? (OnVehicleDamageStatusUpdate)

public OnVehicleDamageStatusUpdate(vehicleid, playerid)
{
new rand = random(3);
if(rand == 1)PlayerPlaySound(playerid,100015);
if(rand == 2)PlayerPlaySound(playerid,100010);
if(rand == 0)PlayerPlaySound(playerid,100005);
return 1;
}

so? why it dont working? help plz

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what wrong with it? (OnVehicleDamageStatusUpdate)