My pathfinding script is getting a error "Unable to cast double to Vector3"?

Im making it so whenever this AI sees me it will start to chase me and there is to scripts im using for this 1. Making him walk around randomly this isnt the script getting the error

-----------------
--Walking Randomly AI

local human = script.Parent:WaitForChild("Humanoid")
local torso = script.Parent:WaitForChild("Torso")

local clone = script.Parent:Clone()

--[[local pathArgs = {
	["AgentHeight"] = 5,
	["AgentRaidus"] = 2, 
	["AgentCanJump"] = true
}--]]

function move()
	local randX = math.random(-20,20)
	local randZ = math.random(-20,20)
	local goal = torso.Position + Vector3.new(randX,0,randZ)

	local path = game:GetService("PathfindingService"):CreatePath()
	path:ComputeAsync(torso.Position, goal)
	local waypoints = path:GetWaypoints()
	
	if path.Status == Enum.PathStatus.Success then
		for _, waypoint in pairs(waypoints) do
			if waypoint.Action == Enum.PathWaypointAction.Jump then
				human.Jump = true
			end
			human:MoveTo(waypoint.Position)
			human.MoveToFinished:Wait(2)
		end
	else
		print("Path unsuccessful B")
		wait(2)
	end
end

human.Died:Connect(function()
	wait(5)
	clone.Parent = workspace
	game:GetService("Debris"):AddItem(script.Parent,0.1)
end)

local BAIC = game.Workspace.bily117AI
while wait(3) do
	if BAIC.Switch == false then
		break
	end
	move() 
end

and then 2. The region3 script that im making so when a player touches it the AI will chase them and this is the script with the error

---------------------
--Region

local RegionPart = game.Workspace.RegionPart1
local pos1 = RegionPart.Position - (RegionPart.Size / 2)
local pos2 = RegionPart.Position + (RegionPart.Size / 2)
local region = Region3.new(pos1, pos2)

local part  = Instance.new("Part")

part.Anchored = false
part.Size = region.Size
part.Parent = game.Workspace
part.CanCollide = false
part.BrickColor = BrickColor.new("Really red")
part.Transparency = 0.7
part.Position = game.Workspace.RegionPart1.Position
part.Name = ("part")

local weld = Instance.new("Weld")
weld.Part0 = part
weld.Part1 = game.Workspace.RegionPart1
weld.Parent = part

local partt = game.Workspace:WaitForChild("part")
partt.Touched:Connect(function(hit)
	if hit.Parent and hit.Parent:FindFirstChild("Humanoid") then
		
		print("Checkpoint 1")
		
		local BAIC = game.Workspace:WaitForChild("bily117AI")
		local BAICH = BAIC:WaitForChild("Humanoid")
		local BAICT = BAIC:WaitForChild("Torso")
		local switch = BAIC:FindFirstChild("Switch")
		switch = false
			while true do
				wait(1)
				if BAIC.Switch == true then
					break
				end
			
			print("Checkpoint 2")
			
			local Humanoid = hit.Parent			
			local goal = (BAICT.Position - Humanoid.Torso.Position).magnitude
			print(goal)
			local path = game:GetService("PathfindingService"):CreatePath()
			path:ComputeAsync(BAICT.Position, goal)
			local waypoints = path:WayPoints()
			
			if path.Status == Enum.PathStatus.Success then
				for _, waypoint in pairs(waypoints) do
					if waypoint.Action == Enum.PathWaypointAction.Jump then
						BAICH.Jump = true
					end
					BAICH:MoveTo(waypoint.Position)
					BAICH.MoveToFinished:Wait(2)
				end
			else
				print("Path unsuccessful B")
				wait(2)
			end
		end
	end
end)

awnser asap if u can, my discord is bily117#5405 if u wanna dm me about it