How can I run my MPI code with several nodes?

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I have a ROCKS Cluster with 1 frontend and 2 nodes (compute-0-1, compute-0-4) and. I can run my code only in frontend but when I try to run my code whit the nodes of many ways:

output by console of frontend

It always returns me:

mpirun was unable to launch the specified application as it could not find an executable
  • machine_file is located in default path and I tried to put it in a path of my project and contains:

compute-0-1 compute-0-4

¿What am doing wrong?

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