Unable to assign property AnimationId. Content expected, got nil - lua

Question

I don't know what's happening, but i'm getting that error in output. Apparently every animations of the Anims table and normalcombo table exists, and the property too. I tested it in Commandbar but didn't work. I don't know how to fix it and don't know what's the problem. Please help me. Code below:
--Local Script
local Replicated = game:GetService("ReplicatedStorage")
local UIS = game:GetService("UserInputService")
local Remote = Replicated.CombateEvent
local Player = game.Players.LocalPlayer
local Char = Player.CharacterAdded:Wait()
local Humanoid = Char:WaitForChild("Humanoid")
local istoolequipped = false
script.Parent.Equipped:Connect(function()
istoolequipped = true
end)
script.Parent.Unequipped:Connect(function()
istoolequipped = false
end)
local lastM1Time = 0
local lastM1End = 0
local combo = 1
local canAir = true
local Anims = {
"rbxassetid://12270296026",
"rbxassetid://12290262661",
"rbxassetid://12290234803",
}
local normalcombo = {
"rbxassetid://12303443278",
"rbxassetid://12303443278",
"rbxassetid://12303527113",
"rbxassetid://12303770582"
}
function hb(size, cframe, ignore, char)
local hitbox = Instance.new("Part", workspace)
hitbox.Size = size
hitbox.CFrame = cframe
hitbox.Anchored = true
hitbox.CanCollide = false
hitbox.Transparency = .6
hitbox.Name = "hb"
hitbox.Material = Enum.Material.ForceField
hitbox.CanQuery = false
local connection
connection = hitbox.Touched:Connect(function()
connection:Disconnect()
end)
local lasttarget
for _, v in pairs(hitbox:GetTouchingParts()) do
if v.Parent:FindFirstChild("Humanoid") and table.find(ignore, v.Parent.Name) == nil then
if lasttarget then
if (lasttarget.Position - char.PrimaryPart.Position).Magnitude > (v.Position - char.PrimaryPart.Position).Magnitude then
lasttarget = v.Parent.PrimaryPart
end
else
lasttarget = v.Parent.PrimaryPart
end
end
end
hitbox:Destroy()
if lasttarget then
return lasttarget.Parent
else
return nil
end
end
UIS.InputBegan:Connect(function(input, istyping)
if istyping then return end
if input.UserInputType == Enum.UserInputType.MouseButton1 and tick() - lastM1Time > .3 and tick() - lastM1End > .7 and istoolequipped then
if tick() - lastM1Time > .7 then
combo = 0
end
lastM1Time = tick()
local animation = Instance.new("Animation", workspace.Animation)
local air = nil
if UIS:IsKeyDown("Space") and canAir == true and combo == 2 then
canAir = false
air = "Up"
animation.AnimationId = Anims[1]
elseif UIS:IsKeyDown("Space") and combo == 3 and not canAir then
air = "Down"
animation.AnimationId = Anims[2]
else
animation.AnimationId = normalcombo[combo]
end
local load = Humanoid:LoadAnimation(animation)
load:Play()
animation:Destroy()
local hitTarg = hb(Vector3.new(3,5,3), Char.PrimaryPart.CFrame * CFrame.new(0,0,-3), {Char}, Char)
local Info = {
["Target"] = hitTarg,
["Combo"] = combo,
["Character"] = Char,
["Air"] = air
}
Remote:FireServer("Combo", Info)
if combo == #normalcombo then
combo = 1
lastM1End = tick()
else
combo += 1
end
Humanoid.WalkSpeed = 0
task.wait(.4)
Humanoid.WalkSpeed = 16
end
end)
The error send me to this line: "animation.AnimationId = normalcombo[combo]"

Answer 1

The error is telling you that normalcombo[combo] is returning nil when it should be a content url. That means that combo isn't a value between 1 and #normalcombo (4).
The only place where that could be is here :
if tick() - lastM1Time > .7 then
combo = 0
end
Here you are resetting the combo counter, but you set it too low. Arrays in lua are 1-indexed. You need to set it to :
combo = 1