Sounds cannot be heard ? NEED HELP

    if FireSound then
    ff = Instance.new("Sound")
    bb = Instance.new("Sound")
    bb.SoundId =''-- bullet 
    ff.SoundId ='' -- fire
    bb.Volume = 1
    ff.Volume = 1
    bb.Pitch = 0.8
    ff.Pitch = 1
    bb.Parent = script.Parent.A1
    ff.Parent = script.Parent.Main
    bb:Play()   
    ff:Play()

Basically these are from my gun, when u shoot it emits sounds from special parts, but my ff and bb are marked as blue ~~~~ lines, also my friend cannot hear these sounds when i shoot ?? whats the prob

P.s i removed the sounds so people don't take them

PLS people help me ;-;

I already know that its a localscript causing this but i don't know how to fix it ? so someone pls ???