Why does Pid = Spawn/3 give a badmatch?

[Jeff Crane]

...
	userConnPid = spawn(?MODULE, userConnHandler,
[Conn]),
...

userConnHandler(Conn) ->
  receive
    go_ahead ->
      inet:setopts(Conn, [{active, true}]);
    _ ->
io:format("tcp_server:debug: userConnHandler did not
receive go_ahead~n")
  end,
  io:format("tcp_server:debug: userConnHandler exited
cleanly:~p~n",[self()]).

When I get to the spawn/3 I get:

** exited: {{badmatch,<0.144.0>},
            [{tcp_server,receive_loop,3},
             {erl_eval,do_apply,5},
             {shell,exprs,6},
             {shell,eval_loop,3}]} **

=ERROR REPORT==== 27-Aug-2006::11:10:46 ===
Error in process <0.136.0> with exit value:
{{badmatch,<0.144.0>},[{tcp_se
rver,receive_loop,3},{erl_eval,do_apply,5},{shell,exprs,6},{shell,eval_loop,3}]}

I dont understand what's badmatching

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