Help can someone help me fix this script? Parent and userinput

Ok, so I am getting so many errors! And I need hep to ix the code can anybody help?

Error:

14:09:13.553 - local player = game.Players.LocalPlayer
14:09:13.553 - 
14:09:13.554 - local userInputService = game:GetService("UserInputService")
14:09:13.555 - 
14:09:13.555 - local animationID = "rbxassetid://5149640147"
14:09:13.556 - 
14:09:13.556 - local animPlaying = false
14:09:13.557 - 
14:09:13.558 - function crouch()
14:09:13.558 -  if player:FindFirstChild("Contestant") then
14:09:13.559 -      if animPlayin:43: attempt to index nil with 'Parent'

Code:

local player = game.Players.LocalPlayer

local userInputService = game:GetService("UserInputService")

local animationID = "rbxassetid://5149640147"

local animPlaying = false

function crouch()
    if player:FindFirstChild("Contestant") then
        if animPlaying == false then
            local animObj = Instance.new("Animation")
            animObj.AnimationId = animationID
            local loadedAnim = player.Character.Humanoid:LoadAnimation(animObj)
            loadedAnim:Play()
            player.Character.Humanoid.WalkSpeed = 10
            animPlaying = true
            script.Parent.Crouch.ImageColor3 = Color3.fromRGB(26, 144, 255)
            script.Parent.Crouch.TextLabel.BackgroundColor3 = Color3.fromRGB(26, 144, 255)
            print("Playing")
        else
            print("Stopping")
            for i , v in pairs(player.Character.Humanoid:GetPlayingAnimationTracks()) do
                v:Stop()
            end
            player.Character.Humanoid.WalkSpeed = 16
            animPlaying = false
            script.Parent.Crouch.ImageColor3 = Color3.fromRGB(255,255,255)
            script.Parent.Crouch.TextLabel.BackgroundColor3 = Color3.fromRGB(255,255,255)
        end
    end
end

local userInputService = game:GetService("UserInputService")

userInputService.InputBegan:Connect(function(input,gpe)
    if input.KeyCode == Enum.KeyCode.LeftControl then
        print("Correct input")
        crouch()
    end
end)

script.Parent:WaitForChild("Crouch").MouseButton1Click:Connect(function()
    crouch()
end)

game.ReplicatedStorage.ToggleCrouch.OnClientEvent:Connect(function(visiblity)
    script.Parent.Crouch.Visible = visiblity
    for i , v in pairs(player.Character.Humanoid:GetPlayingAnimationTracks()) do
        v:Stop()
    end
    player.Character.Humanoid.WalkSpeed = 16
    animPlaying = false
    script.Parent.Crouch.ImageColor3 = Color3.fromRGB(255,255,255)
    script.Parent.Crouch.TextLabel.BackgroundColor3 = Color3.fromRGB(255,255,255)
end)

I'm new to scripting so please help :(