mpi issues on nest tutorial

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HI!

I 've met a mpi setting error after I submit run_croco.bash.

This error : MPI startup(): PMI server not found. Please set I_MPI_PMI_LIBRARY variable if it is not a singleton case.

ERROR in MPI_Setup: number of MPI-nodes should be 8 instead of 1.

Month Y1M1 did not work.

I have comfirmed that the mpi settings in cpp.h，param.h and run_croco.bash correspond, and I guess there may be some differences between parentgrid and childgrid in parallel computation, but I still quite not sure about that mistake. In param.h, parameter (NP_XI=2, NP_ETA=4, NNODES=NP_XI*NP_ETA), and in run_croco.bash, I set NBPROCS=8.

Any suggestions and guidance are greatly appreciated.