>    I'm setting up disco on a new computer and am running into an irritating
>    erlang error (when running

>  python examples/util/count_words.py) on a localhost machine. I have not installed disco, just using ./bin/disco nodaemon.
>  The error is:

>  {badarg,[{erlang,open_port,
>                   [{spawn,"nice -n 19 /home/bvdeenen/disco/root/data/localhost/4c/Job@548:f1dd1:14d9e/usr/local/l ib/python2.7/dist-packages/disco/worker/classic/worker.py"},
>                    [{cd,"/home/bvdeenen/disco/root/data/localhost/4c/Job@548:f1dd1:14d9e"},
>                     stream,binary,exit_status,use_stdio,stderr_to_stdout,
>                     {env,[{"DISCO_DEBUG",false},
>                           {"DISCO_MASTER_ROOT",false},
>                           {"DDFS_PUT_MAX",false},
>                           {"DISCO_TEST_PURGE",false},
>                           {"DISCO_PORT",false},
>                           {"DISCO_JOB_OWNER",false},
>                           {"DISCO_PROXY_PID",false},
>                           {"DISCO_TEST_HOST",false},
>                           {"DISCO_NAME",false},
>                           {"DISCO_PROXY_PORT",false},
>                           {[...],...},
>                           {...}|...]}]],
>                   []},
>           {disco_worker,handle_cast,2,
>                         [{file,"src/disco_worker.erl"},{line,127}]},
>           {gen_server,handle_msg,5,
>                       [{file,"gen_server.erl"},{line,607}]},
>           {proc_lib,init_p_do_apply,3,
>                     [{file,"proc_lib.erl"},{line,227}]}]}

>  I have just confirmed that the issue is with erlang R15B02, going back to R01 makes the issue disappear.
>  I'm not good enough with disco yet to try to fix it.