Running AnimationTrack Not Playing?

Hello, I am having a problem with the AnimationTrack instance. It seems not to be playing when the humanoid is running. (By the way, I don't Use UserInputService.InputBegan because when the player holds 2 keys, the animation stops. I use Humanoid.StateChanged because this is accurate of the current humanoid status, meaning that it will be always correct. Used pcall to catch errors.) (I also called it "Animate" so it overrode the default animation script, on a local script)

Everything still is working fine, the pcall return, the StateChanged event, the RemoteEvent to the server.. (Also I just used the server to change the humanoid's WalkSpeed value and this allows it to be FE (Or is player WalkSpeed already FE? I also used the server for client sanity checks.)

Here is the client-sided code:

    local players = game.Players
local player = players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
local animwalk = script:WaitForChild("Animation")
local humanoid = char:WaitForChild("Humanoid")

local loadwalk = humanoid.Animator:LoadAnimation(animwalk)

humanoid.StateChanged:Connect(function(old, new)
    if new == Enum.HumanoidStateType.Running then
        local succ, err = pcall(function()
            print("anim playing")
            loadwalk:Play()
            wait(5)
            game.ReplicatedStorage.OnWalkBoostSpeedRequest:FireServer(humanoid, speed)
        end)
        if succ then
            print("Success!")
        end
        if err then
            print("Something is wrong!")
        end
    else
        print("Not Running!")
    end
    if new == Enum.HumanoidStateType.Jumping then
        print("Player is jumping")
        loadwalk:Stop()
    end
end)

Finally, the server-sided code:

game.ReplicatedStorage.OnWalkBoostSpeedRequest.OnServerEvent:Connect(function(player, humanoidPassed, speedPassed)
    local succ, err = pcall(function()
        if humanoidPassed.WalkSpeed == 16 then
            humanoidPassed.WalkSpeed = humanoidPassed.WalkSpeed + 4
        else
            wait(4)
            if humanoidPassed.WalkSpeed == 16 then
                print("Changed back")
            else
                print("Changing players walkspeed back to default..")
                humanoidPassed.WalkSpeed = 16
            end
        end
    end)
    if succ then
        print("Success!")
    elseif err then
        print("There seems to be a error, go check it out: "..err)
    end
end)

I don't know why it isn't working. The whole scripts got saved, so its unexplainable for me how it stopped working. Thank you for reading this.