Open RTE was unable to open the hostfile:

[mohamed khuili]

hello everyone,
I happened to generate the executable of CP2K in Parallel mode using 
gfortran and openmpi, when I type the following commaned:
  / home/khuil/cp2k-2.3/exe/Linux-x86-64-g95/cp2k.popt C.inp
it all works well
but when I want to use my computer (just personnal computer) fives processor core 
i5 hp I type:
mpirun-np 5 / home/khuil/cp2k-2.3/exe/Linux-x86-64-g95/cp2k.popt C.inp
it gives me the following message:


-------------------------------------------------- ------------------------
Open RTE was unable to open the hostfile:
     / usr/lib64/mpi/gcc/openmpi/etc/openmpi-default-hostfile
Check to make safe the path and filename are correct.
-------------------------------------------------- ------------------------
[linux-dmar.site: 03147] [[36363.0], 0] ORTE_ERROR_LOG: Not found in file base 
/ ras_base_allocate.c at line 200
[linux-dmar.site: 03147] [[36363.0], 0] ORTE_ERROR_LOG: Not found in file base 
/ plm_base_launch_support.c at line 99
[linux-dmar.site: 03147] [[36363.0], 0] ORTE_ERROR_LOG: Not found in file 
plm_rsh_module.c at line 1167
khuil @ linux-dmar ~ / cp2k-2.3/tests/QS> mpirun-np 2 / 
home/khuil/cp2k-2.3/exe/Linux-x86-64-g95/cp2k.popt C.inp

please help me to find the solution
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