Error Message from Task 0:: No such file or directory


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I'm new to NWChem and facing issue to run a simple test job. the command I used to run NWChem is :
mpirun -np 2 nwchem testnw2.nw >> testnw2.out

I get the below error

mpirun -np 2 nwchem testnw2.nw >> testnw21.out
[proxy:0:0@atlas5-c01] HYDU_create_process (./utils/launch/launch.c:75): execvp error on file nwchem (No such file or directory)
[proxy:0:0@atlas5-c01] HYDU_create_process (./utils/launch/launch.c:75): execvp error on file nwchem (No such file or directory)
[root@atlas5-c01 test2]# cat testnw21.out

=======================================================================
= BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
= EXIT CODE: 255
= CLEANING UP REMAINING PROCESSES
= YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
=======================================================================

Appreciate any help.

Srikanth