[SOLVED] Why is my 3DMG not working in online mode?

The following script is in a localscript, and it all seems to work completely fine in solo, but completely breaks in online mode.

Player = game.Players.LocalPlayer
Mouse = Player:GetMouse()
Torso = Player.Character.Torso
UpdateGrapple = false
Speed = 50
debounce = false


function WeighModel(Model)
    RawWeight = 0
    for i,v in pairs(Model:GetChildren()) do
        if v:IsA("BasePart") then
            RawWeight = RawWeight + v:GetMass()
        end
    end
    DividedWeight = RawWeight/7
    return DividedWeight
end

function Grapple(Location, MTar)
    if MTar == nil then return end
    Player.Character.Humanoid.Died:connect(function ()
        Container:Destroy()
        if Torso:FindFirstChild("RocketPropulsion") ~= nil then
            Torso.RocketPropulsion:Destroy()
        end
    end)
    Container = Instance.new("Model", game.Workspace)
    Container.Name = Player.Name.."Container"
    print("Firing grapple!")
    loc = Location.p
    distance = (loc - Torso.Position).magnitude
    print("Defined variables")
    Target = Instance.new("Part", Container)
    Target.Name = Player.Name.."Target"
    Target.Transparency = 1
    Target.FormFactor = Enum.FormFactor.Custom
    Target.Size = Vector3.new(.2, .2, .2)
    Target.Anchored = false
    print("Made target")
    W = Instance.new("ManualWeld", Target)
    W.Part0 = Target
    W.Part1 = MTar
    W.C0 = CFrame.new()
    W.C1 = MTar.CFrame-MTar.CFrame.p
    print("Welded target")
    Target.CFrame = Location
    RP = Instance.new("RocketPropulsion", Player.Character.Torso)
    RP.CartoonFactor = 1
    RP.Target = Target
    RP.MaxThrust = 7500
    RP.MaxTorque = Vector3.new(2000, 2000, 2000)
    RP.MaxSpeed = Speed
    RP:Fire()
    print("Made and fired RP. Starting the wire sequence")
    CharWeight = WeighModel(Player.Character)
    repeat
        loc = Target.Position
        Wire = Instance.new("Part", Container)
        Wire.Name = Player.Name.."Wire"
        Wire.BrickColor = BrickColor.new("Really black")
        Wire.Transparency = 0
        Wire.Anchored = true
        Wire.CanCollide = false
        Wire.TopSurface = Enum.SurfaceType.Smooth
        Wire.BottomSurface = Enum.SurfaceType.Smooth
        Wire.formFactor = Enum.FormFactor.Custom
        distance = (loc - Torso.Position).magnitude
        Wire.Size = Vector3.new(0.2, 0.2, distance)
        Wire.CFrame = CFrame.new(loc, Torso.CFrame.p) * CFrame.new(0, 0, -distance/2)
        wait()
        Wire:Destroy()
        CurrentVelocity = Torso.Velocity
    until UpdateGrapple == false
    Torso.Velocity = (CurrentVelocity + Vector3.new(0, 5, 0))*CharWeight
    print("Wire sequence ended.")
    print("Unlatched!")
    Container:Destroy()
    RP:Destroy()
end

Mouse.KeyDown:connect(function (Key)
    if Key == "q" then
        UpdateGrapple = true
        Grapple(Mouse.hit, Mouse.Target)
        print("Latched!")
    end
end)

Mouse.KeyUp:connect(function (Key)
    if Key == "q" then
        UpdateGrapple = false
        print("UpdateGrapple been set to false")
    end 
end)

Do I need to make them localfunctions and local variables for this to work?