hi does any one know about this error :

Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:

PMPI_Comm_rank(108): MPI_Comm_rank(comm=0x0, rank=0x7fff24a405bc) failed

PMPI_Comm_rank(66).: Invalid communicator

Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:

PMPI_Comm_rank(108): MPI_Comm_rank(comm=0x0, rank=0x7fff63e1598c) failed

PMPI_Comm_rank(66).: Invalid communicator

it is when i run mpich like :

mpirun -np 2 ./coawstM   swan_only.in

i don't know if this is a problem in my executable file (coawstM) or this is from mpich or any other hardware issues or anything else 

thank you for your help

nazi

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