Error trying tutorial 17

[Ferreira Maurizio]

I tried tutorial 17 on a single computer, having name ferreira-d

After having started :

  erl -sname pong in a dos box
  erl -sname ping in another dos box

And having stated the pong process in the pong box
tut17:start_pong().

I try to start the ping process in the ping box
But I receive the following error:


tut17:start_ping(pong@REDACTED).

=ERROR REPORT==== 20-Jun-2006::12:33:21 ===
Error in process <0.38.0> on node 'ping@REDACTED' with exit value:
{badarith,[{erl_eval,eval_op,3},{erl_eval,expr_list,6},{erl_eval,expr,
5},{shell,exprs,6},{shell,eval_loop,3}]}

** exited: {badarith,[{erl_eval,eval_op,3},
                      {erl_eval,expr_list,6},
                      {erl_eval,expr,5},
                      {shell,exprs,6},
                      {shell,eval_loop,3}]} **
(ping@REDACTED)3>


Is something related tho the unusual machine name ? (ferreira-d)
Thanks
Maurizio Ferreira.