Why does my float script works in game but not in server?

Hello, in my game I made an ocean, which is one big flat brick. I want the player to be able to float in this ocean instead of falling through. So I made a script that does just that (located in the ocean brick in the workspace, normal script):

local swim = false --Debounce
local o = script.Parent --Ocean part

function onTouched(part)
    local h = part.Parent:findFirstChild("Torso")
    if h ~= nil then
        swim = true
        local s = game.Players.LocalPlayer.Swim --Variable that is created when the game starts (more on that later) 
        local b = Instance.new("BodyPosition")
        b.Parent = h
        b.Position = Vector3.new(h.Position.X,o.Position.Y,h.Position.Z)
        while true do
            s.Value = true
            wait()
            if h.Position.Y > o.Position.Y then
                b:Destroy()
                s.Value = false
                swim = false
            end     
        end

    end

end

script.Parent.Touched:connect(onTouched)

This script works perfectly fine, and if you're wondering about the "game.Players.LocalPlayer.Swim" its a bool value that another script creates at the beginning of the game so when the player touches the ocean it turns on, so the game knows if the player is in or out of the ocean.

Here is the script that creates the bool value (located in starter player scripts, local script):

game.Workspace:WaitForChild(game.Players.LocalPlayer.Name)
s = Instance.new("BoolValue", game.Players.LocalPlayer)
s.Name = "Swim"
s.Value = false

and here is the script that once the player presses space, it checks to see if that bool value is true or false (also located in the starter player scripts, local script):

game:GetService("UserInputService").InputBegan:connect(function(inputObject, gameProcessedEvent)
    if inputObject.KeyCode == Enum.KeyCode.Space then 
    local s = game.Players.LocalPlayer.Swim.Value
        if s == true then
            print("Swimming")
        end
        if s == false then
            print("Not Swimming")
        end
    end 
end)

These work fine and do what I want, now that I'm done explaining, here is my problem:

It doesn't work in server mode.

When I test the game it works just fine but when I fire up a server it completely fails and I get the error: "Workspace.Ocean.Script:8: attempt to index field 'LocalPlayer' (a nil value)"

Any help? Thanks!