Script doesn't work on published version only at studio?

This script is inside a textbutton , it works on studio but on published version it's not.

local mouse = game.Players.LocalPlayer:GetMouse()
local ply = game.Players.LocalPlayer.Name
a = game.ReplicatedStorage.TestModel:clone()


script.Parent.MouseButton1Click:connect(function()

    a.Parent = game.Workspace
    a:MakeJoints()
    mouse.TargetFilter = a


    a:MoveTo(Vector3.new(mouse.Hit.p.X, mouse.Hit.p.Y + (a:GetExtentsSize().Y / 2), mouse.Hit.p.Z))
    a:MoveTo(Vector3.new(mouse.Hit.p.X, mouse.Hit.p.Y, mouse.Hit.p.Z))
    target = game.Players.LocalPlayer:GetMouse().Hit

    game.Workspace.TestModel.plyName.Value = ply
    print("cloned")
end)

Developer console log http://i.imgur.com/vQ30xiC.jpg