Unexpected error when script executed?

Hello. I was making a script, but then, it got an error. Here’s the script you should look into.

local assetId = 2176383273
local InsertService = game:GetService("InsertService")
local model = InsertService:LoadAsset(assetId)
model.Parent = game.Workspace
wait()
local Audio = Instance.new("Sound",game.Workspace)
Audio.SoundId = "rbxassetid://549313210"
Audio.Volume = 3
Audio.Name = "CoreAlarm"
Audio.Looped = True
Audio:Play()
wait()
local MSG1 = Instance.new("Message",game.Workspace)
MSG1.Text = "ALL REACTOR CORE SAFEGUARDS ARE NOW NONFUNCTIONAL! PLEASE PREPARE FOR REACTOR CORE MELTDOWN"
wait(6)
MSG1:remove()
wait()
local Audio = Instance.new("Sound",game.Workspace)
Audio.SoundId = "rbxassetid://1000895732"
Audio.Volume = 3
Audio.Name = "SelfDestructMessage"
Audio:Play()
wait(200)
local MSG2 = Instance.new("Message",game.Workspace)
MSG2.Text = "Reactor Meltdown in 4 minutes)
wait()
local Audio = Instance.new("Sound",game.Workspace)
Audio.SoundId = "rbxassetid://1000912359"
Audio.Volume = 3
Audio.Name = "SelfDestructMessageB"
Audio:Play()
wait(5)
MSG2:remove()
wait()
local Audio = Instance.new("Sound",game.Workspace)
Audio.SoundId = "rbxassetid://466949705"
Audio.Volume = 3
Audio.Name = "CoreCorruptionMusic"
Audio:Play()
wait(200)
local Audio = Instance.new("Sound",game.Workspace)
Audio.SoundId = "rbxassetid://1002834205"
Audio.Volume = 3
Audio.Name = "SelfDestructMessageC"
Audio:Play()
wait(5)
local MSG3 = Instance.new("Message",game.Workspace)
MSG3.Text = "Self destruct in 2 minutes! Please evacuate now."
wait(5)
MSG3:remove()
wait()
local m = Instance.new("Hint", game.Workspace)
wait()
local unit = 190
wait()
for i = 1,200 do
    unit = unit - 1
    m.Text = "Prepare to meet your demise. T-"  ..unit.. " Seconds till the universe is destroyed."
    wait(1)
end
local Hint = Instance.new("Hint",game.Workspace)
Hint.Text = "CAUTION! CORE WILL EXPLODE NOW!"
wait(3)
for i = 1,5 do
    unit = unit - 1
    Hint.Text = "YOU HAVE T-"  ..unit.. " SECONDS TILL THE CORE EXPLODE!"
    wait(1)
end
Hint:Remove()
wait()
local assetId = 11277172
local InsertService = game:GetService("InsertService")
local model = InsertService:LoadAsset(assetId)
model.Parent = game.Workspace
model.Name = "NUKE"
wait(1)
local m = Instance.new("Message",game.Workspace)
for i = 1,60 do
    unit = unit - 1
    m.Text = "Server shutting down in"  ..unit.. " Seconds."
    wait(1)
end
game.Players:ClearAllChildren()

I really hate when I get errors and don’t know how to fix them, so I am counting on you guys.

Regarding, Naderssrr