Alternating between walking animations?

I have a script that places the player in control of a custom character with a walking and idle animation. I'm trying to have the walking animation change based on the status of a string value. When I change the string value, Instead of playing the alternate walking animation, the character just plays the idle animation. Thanks for any help.

wait(1)
local player
while not player do
    wait()
    player = game:GetService('Players').LocalPlayer
end

function onSpawn()
    local char = game.ReplicatedStorage["New Player"]:Clone()
    local SpawnLocation = game.Workspace.SpawnLocation
    char.Parent = workspace
    char.Name = player.Name
    char:MoveTo(SpawnLocation.Position)

    local prevChar = player.Character
    wait()
    player.Character = char
    prevChar:Destroy()

    if char:FindFirstChild("Humanoid") then
    char.Humanoid:Destroy()
    end
    local human = Instance.new("Humanoid", char)
    char.Archivable = false
    human.WalkSpeed = 8

    human.Died:connect(function()
wait(1)
        onSpawn()
        wait(.1)
    player.Character.Humanoid.Running:connect(onGround)
    end)

    --Player Values
    local move_left = false
    local move_right = false
    local already_ran = false
    local grounded = false
    local idleAnimation = Instance.new("Animation")
    idleAnimation.AnimationId = "rbxassetid://317651678"
    local runningAnimation = Instance.new("Animation")
    runningAnimation.AnimationId = "rbxassetid://319211805"
    local R2 = Instance.new("Animation")
    R2.AnimationId = "rbxassetid://319228239"
    --local I2 = Instance.new("Animation")
    --I2.AnimationId = "rbxassetid://319228239"


    function playAnimation(parent)
        local AnimTrack = player.Character.Humanoid:LoadAnimation(parent)
        AnimTrack:Stop()
        wait(.1)
        AnimTrack:Play()
    end

    function onGround(speed)
        if grounded == false then
            grounded = true
        end
        if speed > 1 and player.PlayerGui.SwordPlaySystem.Stance.Value == ("Left") then
            if already_ran == false then
                already_ran = true
                playAnimation(runningAnimation)

                elseif  speed > 1 and player.PlayerGui.SwordPlaySystem.Stance.Value == ("Right")    then
                    if already_ran == false then
                        already_ran = true
                        playAnimation(R2)
                end 
            end 
        else
            already_ran = false
            playAnimation(idleAnimation)
        end
    end

end

onSpawn()

    player.Character.Humanoid.Running:connect(onGround)