anchor.diff:  	    SlavePid ! {self(), code:get_path()},
   	    undefined = put(slave_pid, SlavePid),
   	    ok;
  -	{error, {already_running,_}} ->
  +	{error, {already_running, _}} ->
   	    ok
       end.
   
  
positive.code: 	    slave:stop(Node),
  	    erase(slave_pid),
  	    false;
  	{error, {already_running,_}} ->
  	    true
      end.
  
negative.code:     %% stop eventuall nodes
      ok = stop(),
      Host = list_to_atom(net_adm:localhost()),
      case net_kernel:start([mastername(), shortnames]) of
  	{ok, Pid} ->
  	    Pid;
  	{error, {already_started, Pid}} ->
  	    Pid
      end,
      case slave:start_link(Host, slavename()) of
  	{ok, Node} ->
  