What am I doing wrong? [Solved]

Basically this is a launch script that will work based on the new nerfed explosions and physics engine. I keep having issues pop up with Lines 64, 65, and 77. Can anyone read through this and help me correct it? (I am fairly new to RBX.Lua and scripting in Roblox as a whole so I apologize if I come off as "stupid").

print("Script Active. Waiting Launch.")
local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Ready for Launch."
Main = game.Workspace.Rocket.RocketModel.Head
Top = game.Workspace.Rocket.RocketModel.Head2
Booster = game.Workspace.Rocket.RocketModel.Booster
GantrySide = game.Workspace.Gantry.gantrymiddle.Side
Middle = game.Workspace.Rocket.RocketModel.Middle

function onClicked()
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 10"
	print("Omicron I Launching in 10")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 9"
	print("Omicron I Launching in 9")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 8"
	print("Omicron I Launching in 8")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 7"
	print("Omicron I Launching in 7")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 6"
	print("Omicron I Launching in 6")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 5"
	print("Omicron I Launching in 5")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 4"
	print("Omicron I Launching in 4")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 3"
	print("Omicron I Launching in 3")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 2"
	print("Omicron I Launching in 2")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launching in 1"
	print("Omicron I Launching in 1")
	wait(1)
	local h = Instance.new("Hint",Workspace) h.Text = "Ignition"
	print("Ignition")
	wait(1)
	explosion = Instance.new("Explosion")
	explosion.BlastRadius = 50
	explosion.BlastPressure = 1000
	explosion.DestroyJointRadiusPercent = 0
	explosion.Position = Booster.Position
	explosion.Parent = game.Workspace
	wait(1)
	explosion = Instance.new("Explosion")
	explosion.BlastRadius = 50
	explosion.BlastPressure = 1000
	explosion.DestroyJointRadiusPercent = 0
	explosion.Position = Booster.Position
if
	Main.Velocity.y > 100
	then
	local h = Instance.new("Hint",Workspace) h.Text = "Liftoff."
	print("Liftoff")
	wait(2)
	explosion = Instance.new("Explosion")
	explosion.BlastRadius = 50
	explosion.BlastPressure = 750
	explosion.DestroyJointRadiusPercent = 0
	explosion.Position = Booster.Position
else
	explosion = Instance.new("Explosion")
	explosion.BlastRadius = 50
	explosion.BlastPressure = 2500
	explosion.DestroyJointRadiusPercent = 0
	explosion.Position = Booster.Position
repeat
	explosion = Instance.new("Explosion")
	explosion.BlastRadius = 50
	explosion.BlastPressure = 3000
	explosion.DestroyJointRadiusPercent = 0
	explosion.Position = game.Workspace.Rocket.RocketModel.Booster
until Main.Velocity.y > 21000
	wait(2)
	if Main.Velocity.y > 20000
	then
	wait(5)
	if Main.Velocity.y > 19500
		then
		wait(5)
		explosion = Instance.new("Explosion")
		explosion.BlastRadius = 50
		explosion.BlastPressure = 2500
		explosion.DestroyJointRadiusPercent = 0
		explosion.Position = Booster.Position
	else
		explosion = Instance.new("Explosion")
		explosion.BlastRadius = 50
		explosion.BlastPressure = 4750
		explosion.DestroyJointRadiusPercent = 0
		explosion.Position = Booster.Position
		if Main.Velocity.y < 1
			then
			local h = Instance.new("Hint",Workspace) h.Text = "Omicron I Launch Failed."
			wait(2)
			local h = Instance.new("Hint",Workspace) h.Text = "Please contact Launch Administrators."
			wait(2)
			repeat
				
			until Main.Velocity.y > 10
			if Main.Velocity.y > 10
				then
				print("Catastrophic Failure Imminent.")
				local h = Instance.new("Hint",Workspace) h.Text ="Catastrophic Failure Imminent. Please Clear the Area."
				wait(2)
				local h = Instance.new("Hint",Workspace) h.Text ="Systems Failed. Catastrophic Failure Imminent. Please Clear the Area"
				wait(2)
				local h = Instance.new("Hint",Workspace) h.Text = "Cooling Systems Failure. Danger Level - Extremely High"
				wait(2)
				local h = Instance.new("Hint",Workspace) h.Text = "Cooling Systems Reboot..."
				explosion = Instance.new("Explosion")
					explosion.BlastRadius = 50
					explosion.BlastPressure = 100000
					explosion.DestroyJointRadius = 95
					explosion.Position = Booster.Position
					wait(1)
					local h = Instance.new("Hint",Workspace) h.Text = "Reboot Failed. Catastrophic Failure Imminent. Please Clear the Area"
					wait(2)
					explosion = Instance.new("Explosion")
					explosion.BlastRadius = 25
					explosion.BlastPressure = 5000
					explosion.DestroyJointRadius = 95
					explosion.Position = GantrySide.Position
					wait(3)
					local h = Instance.new("Hint",Workspace) h.Text = "Operational Systems Failed. Shutting Down..."
					wait(2)
					explosion = Instance.new("Explosion")
					explosion.BlastRadius = 125
					explosion.BlastPressure = 500000
					explosion.DestroyJointRadius = 95
					explosion.Position = Middle.Position
					wait(1)
					explosion = Instance.new("Explosion")
					explosion.BlastRadius = 185
					explosion.BlastPressure = 7500
					explosion.DestroyJointRadius = 95
					explosion.Position = Top.Position
					wait(5)
					end
				end
			end
		end
	end
end
script.Parent.ClickDetector.MouseClick:connect(onClicked)

Dev Console/Output:

20:00:25 -- Workspace.rocket.Explosion trigger.Script:77: bad argument #3 to 'Position' (Vector3 expected, got userdata) 20:00:25 -- Script 'Workspace.Rocket.Explosion trigger.Script', Line 77 20:00:25 -- Stack End