mpirun error

Dear lammps user

My lammps was running fine till I installed quantum espresso. Now when I run the command mpirun -np 6 lmp_mpi -in, I following error:

It looks like MPI_INIT failed for some reason; your parallel process is
likely to abort. There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or environment
problems. This failure appears to be an internal failure; here’s some
additional information (which may only be relevant to an Open MPI

ompi_mpi_init: ompi_rte_init failed
–> Returned “(null)” (-43) instead of “Success” (0)