Why is my bindable function hanging up when invoked and not running?

I have this local script in my Player's Gui

print("Starting")
game.ReplicatedStorage:WaitForChild("GetStat"):InvokeServer("swordSkill")
print("Finished")

And this inside a bindable function within the ReplicatedStorage

function script.Parent.OnServerInvoke(player,statName)
    print("Invoked")
    return game.ServerStorage:FindFirstChild(player.Name):FindFirstChild(statName).Value
end

The Local Script starts, but when it reaches the invoking line, it hangs up and stops. There's no error, and the script inside the bindable function doesn't run. I've tried other methods for my script including:

script.Parent.OnServerInvoke:Connect(function(player,statName)
    print("Invoked")
    return game.ServerStorage:FindFirstChild(player.Name):FindFirstChild(statName).Value
end)

and

script.Parent.OnServerInvoke = function(player,statName)
    print("Invoked")
    return game.ServerStorage:FindFirstChild(player.Name):FindFirstChild(statName).Value
end

All produce the same results. Why isn't the bindable function being invoked?