Respected developers and users

I am trying to run a parallel program CPMD with the command " /usr/local/bin/mpirun -np 4 ./cpmd.x 1-h2-wave.inp > 1-h2-wave.out &" , it
is giving the following error:
======================================================================================================

[testcpmd@slater CPMD_3_15_3]$ /usr/local/bin/mpirun -np 4 ./cpmd.x 1-h2-wave.inp > 1-h2-wave.out &
[1] 1769
[testcpmd@slater CPMD_3_15_3]$ --------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
with errorcode 999.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun has exited due to process rank 0 with PID 1770 on
node slater.rcamos.iacs exiting improperly. There are two reasons this could occur:

1. this process did not call "init" before exiting, but others in
the job did. This can cause a job to hang indefinitely while it waits
for all processes to call "init". By rule, if one process calls "init",
then ALL processes must call "init" prior to termination.

2. this process called "init", but exited without calling "finalize".
By rule, all processes that call "init" MUST call "finalize" prior to
exiting or it will be considered an "abnormal termination"

This may have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------

[1]+  Exit 231                /usr/local/bin/mpirun -np 4 ./cpmd.x 1-h2-wave.inp > 1-h2-wave.out
======================================================================================================
I am unable to find out the reason of that error. Please help. My Open-MPI version is 1.6.

With regards
Abhra Paul