"LoadAnimation requires an Animation object." Error message?

I have skimmed over this code and made elaborations and so on for the past three hours, and I have finally caved in to asking you big-brained people for assistance. Below is my code for two punch animations:

local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:wait()
local tool = script.Parent
local swingsound = tool:WaitForChild("Swing")
local canattack = tool:WaitForChild("CanAttack")
local Punch1 = Instance.new("Animation")
Punch1.AnimationId = "rbxassetid://4921775472"
local Punch2 = Instance.new("Animation")
Punch2.AnimationId = "rbxassetid://4921778051"

tool.Activated:connect(function()
    local choose = math.random(1,2)
    canattack.Value = true
    if choose == 1 then
        local swing1animation = script.Parent.Parent.Humanoid:LoadAnimation(script.Punch1)
        swingsound:Play()
        swing1animation:Play()
    elseif choose == 2 then
        local swing2animation = script.Parent.Parent.Humanoid:LoadAnimation(script.Punch2)
        swingsound:Play()
        swing2animation:Play()
    end
end)

tool.Deactivated:connect(function()
    canattack.Value = true
end)

tool.Unequipped:connect(function()
    local hum = char:WaitForChild("Humanoid")
    for _,anim in pairs(hum:GetPlayingAnimationTracks()) do
        anim:Stop()
    end
end)

Now, before you ask, yes, the two animations are named (respectively) "Punch1" and "Punch2." They also are not Animations, but rather AnimationTracks. I really appreciate any insight you all can provide.