Please Answer. Region cannot be casted. What is wrong with the script?

Unable to cast Instance to Region3

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


while true do 
	Debounce = true
	wait()
	local PartInRegion = workspace:FindPartsInRegion3(region, nil, 1000)
	for i, part in pairs(PartInRegion) do
		if part.Parent:FindFirstChild("Humanoid") ~= nil then
			Debounce = false
			print("Player Found"..part.Parent.Name)
			local Workspace  = part.Parent
			Workspace.Humanoid:TakeDamage(Workspace.Humanoid.MaxHealth)
			Debounce = true
		end
	end
end

Regions don't take a part. You already created your Region object. Use Area, not region. This is why you're supposed to keep proper naming conventions lol