HP-mpi gethostbyname problem

Hi,Community.

     when I intended to install Materials Studio in linux , the installation has no error. But when I wanted to run a Discover job, it appeared the problem below. It should be the error of configuration of MPI. Could some one tell me how to handle it?Thank you!

                   opt/hpmpi/bin/mpirun -e MPI_REMSH=/usr/bin/ssh -prot -f APPFILE

                   executing parallel Discover on 16 processors

                   mpirun: gethostbyname(tyh-build1) failed

                   mpirun: Cannot find IP for mpirun matching tyh-build1

                   Discover has completed

Best regards,wanglei1258