dear i am a newbie of this forum. i am coupling ROMS and SWAN model which need MCT and MPICH libraries. therefore MCT has been installed by *Code:* ./configure CC=gcc FC=gfortran CPPFLAGS=-I/home/usr/mct/include LDFLAGS=-L/home/usr/mctcal/lib --prefix=/home/usr/mct make install and mpich2 release 1.4.1p1 by *Code:* /configure FC=gfortran CC=gcc --prefix=/home/<user>/mpich2_install_new 2>&1 |tee c.txt make 2>&1 |tee m.txt make install 2>&1 |tee mi.txt but for running coupled model, when i set 1 cpu for SWAN model and 1 for ROMS model (therefore 1 node for each of them) by typing *code:* mpirun -np 2 ./oceanG coupling_inlet-test.in>mpi.log it replies: application called MPI_Abort(comm=0x84000002, 4) - process 0 would you please tell me how i can solved this problem. cheers fereshte ***Angel*** **