ParticleEmitter won't clone onLevelUp?

I have created a script for my friend's game. The script is supposed to clone particles when a player levels up, the particles are very specific and are within the script. I have tested this in Roblox Studio "Play" mode and in a live server, the Particles don't clone themselves and Sound:Play() only works after removing the coding up to

script.Parent.Parent.Parent.Parent.Character.Torso.ParticleEmitter.Parent = nil. 

The script is located in ServerScriptService as a regular script. I've narrowed it down to this snippet of coding, after running print() on each line:

on = false

function onLevelUp(player, XP, level) 
    if player.Character~=nil then 
        for i = 1,5 do 
        script.Parent.Parent.Parent.Parent.Character.Torso.ParticleEmitter.Parent = nil
        on = false
        local e = script.ParticleEmitter:Clone()
        e.Parent = script.Parent.Parent.Parent.Parent.Character.Torso
        script.Sound:Play() 
        wait(3)
        on = true
        end
    end

Thanks for reading/replying.