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Parallelization in SOL700 analysis with NP>1 in NASTRAN 2017.

In a SOL700 analysis with NP=8 in NASTRAN 2017 I get the following error:
 
 "Analysis will be performed using 8 processes.
 Warning: The host list file dmp_hosts is not found
         A default hostfile for the local machine must be created."
 
even though I have a valid mpi running on my pc and NASTRAN PARALLEL=8 statement works fine in other analysis.
How could I use parallelization in a SOL 700 analysis?