[MPICH] mpdboot error

[jetspeed]

Hi all,

I built OFED 1.2 on InfiniBand, with the Mvapich2-0.9.8,
when I run  "mpd" on a node, it works. but when I run "mpdboot -n 1" It outputs as follow:

mpdboot_node01 (handle_mpd_output 359): failed to ping mpd on node01; recvd output={}

and in /tmp there isn't the mpd socket file, but a log file with the content:

logfile for mpd with pid 29122
node01_33226: mpd_uncaught_except_tb handling:
  exceptions.TypeError: sequence item 0: expected string, int found
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpdlib.py  733  handle_ring_listener_connection
        newsock.correctChallengeResponse = \
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpdlib.py  488  handle_active_streams
        handler(stream,*args)
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd.py  266  runmainloop
        rv = self.streamHandler.handle_active_streams(timeout=8.0)
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd.py  240  run
        self.runmainloop()
    /usr/mpi/gcc/mvapich2-0.9.8-15/bin/mpd.py  1344  ?
        mpd.run()

any suggestions ?
thanks in advance.