NPC trying to move to closest character erroring why?

Im trying to make an npc follow since hes the bad guy trying to "kill me". This is my code

local closesdistance = 100 
while wait(1) do
	if game.Lighting.TimeOfDay == "00:00:00" then
		if (game.Players.LocalPlayer.Character.HumanoidRootPart.Position - game.Workspace.badguy.HumanoidRootPart.Position).Magnitude < closesdistance then
			game.Workspace.badguy.Humanoid:MoveTo(game.Players.LocalPlayer.Character.HumanoidRootPart)
			
		end
	end
end

I keep getting an error that says: 16:41:55.862 - Unable to cast Instance to Vector3. What does this mean?

Try

game.Workspace.badguy.Humanoid:MoveTo(game.Players.LocalPlayer.Character.HumanoidRootPart.Position)

MoveTo() needs a Vector3 point, so just add .Position to where it's going to move.