Works perfectly in Studio then doesn't work one bit in Server?

It's an escape pod, that takes off after a button press but it wont work on Server Mode when It works PERFECTLY on Studio the script is Server Script and is inside a ClickDetector inside of a Part inside of a model in Workspace! Help please! :

local a = script.Parent.Parent
local Eng = a.Parent.Engine

debounce = false


function fly()
    if debounce == false then
        debounce = true
        Eng.PowerUp:Play()
        Eng.PowerUp2:Play()
        wait(1)
        Eng.Countdown:Play()
        wait(9.977)
        Eng.Ignite:Play()
        Eng.Fire.Enabled = true
        Eng.ParticleEmitter.Enabled = true
        Eng.BodyVelocity.Velocity = Vector3.new(0,150,0)
    end
end

script.Parent.MouseClick:connect(fly)