Trouble with transfer build to device through Xcode

--MAIN:
local track = require("Tracks")
local flute = require("Flute")
_G.trackCounter = 1 --<< instantiate a global track counter
_G.soundDir = Track.instanceTable[_G.trackCounter].soundDir --<< This will result in: Track.instanceTable[1].soundDir

-- TRACK:
Track = {}
Track.instanceTable = {
    [1] = { soundDir = "/Piano" } --<< I stripped all the code so its easier to read
            }

--FLUTE:
require("Tracks")
local COver --<< Here goes the image file
COver.snd = audio.loadSound( "Sound" .. _G.soundDir .. "/flPinCOver-hd.mp3", { channel=3, volume=100 } )

function Flute:changeSound()
    COver.snd = audio.loadSound( "Sound" .. _G.soundDir .. "/flPinCOver-hd.mp3", { channel=3, volume=100 } )
    COver.name = "flPinCOver-hd.mp3"
    --This will, in the simulator, return the path and soundfile: Sound/Guitar/flPinCOver-hd.mp3
    return true
end