how do i fix attempt to get length of upvalue 'animations' (a number value)?

my script

math.randomseed(tick())

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local punchEvent = Instance.new("RemoteEvent", ReplicatedStorage)
punchEvent.Name = "PunchEvent"

local animations = (2729957815)

local function onPunchFired(plr)
	local char = game.Workspace:FindFirstChild(plr.Name)
	local humanoid = char.Humanoid
	local animation = Instance.new("Animation")
	animation.AnimationId = "http://roblox.com/asset/?id="..animations[math.random(1, #animations)]
	local animTrack = humanoid:LoadAnimation(animations)
	animTrack:Play()
end

punchEvent.OnServerEvent:Connect(onPunchFired)

the error

20:28:03.324 - ServerScriptService.Punch:13: attempt to get length of upvalue 'animations' (a number value)

how do i fix this plss help