Why does this script say that i need to have three arguments if i fix it says unable to covert?

This is the script that has the errors I do have other scripts where i show bellow

local self = {}

function self:StartEnemy(source,enemy)--Source is a array of out nodes that have been collected by central script local stats = require(game.ReplicatedStorage.Moldules.Types.EnemyStats)--returns what with the moldrural script orgional

stats = stats[enemy]

local obj = game.ReplicatedStorage.Assets.Enemys[enemy]:Clone() -- 0bj = object
obj.CFrame = source["StartingPoint"].CFrame
obj.Parent = workspace

for i=1,#source,1 do
	local scf = obj.CFrame
	for j = 0,1,stats.Speed*0.002 do
		obj.CFrame = scf.lerp(source[i].CFrame + Vector3.new(0,obj.Position.Y - source[i].Position.Y,0),j)
		wait(0.01)
	end
end

end

return self

this the stats

local self = { Regular = { Speed = 10, Health = 10, Strengh = 1, } }

return self

this is the last script

local enemyai = require(game.ServerScriptService.Moldules.Classes.Enemy.EnemyAi)

local source = {}

for _,n in pairs(workspace.Cource.Paths:GetChildren()) do source[n.Tag.Value] = n end

source["StartingPoint"] = workspace.Cource.Other.StartPath

enemyai:StartEnemy(source, "Regular")

is there any way to fix it any help would be helpful