gas-solid fluidized bed simulation

hi all,
im trying to simulate gas-solid fluidized bed with two types of different density particles. after giving 'mpirun -np 2 cfdemSolverPiso_shared -parallel' command im getting an error given below:

Executing input script '../DEM/in.insert_pack.'
ERROR: Could not open LIGGGHTS input script
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
with error code 1.

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 2754 on
node ubuntu 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)

can anyone help me to solve this error and what is the problem in the script.
thanks and looking for a reply.

regards,
Anoop