When i set the io variables in env_run.xml, I got the following error. ...........123 node1124 node1125 node1126 node1127 node1 Opened existing file /storage/home/nitin/CESM_NEW/input_data/atm/cam/inic/fv/cami_0000-01-01_1.9x2.5 _L26_c070408.nc -1 Opened existing file /storage/home/nitin/CESM_NEW/input_data/atm/cam/topo/USGS-gtopo30_1.9x2.5_remap _c050602.nc -1 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 13 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 9application called MPI_Abort(MPI_COMM_WORLD, 1) - process 5 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 1 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 :application called MPI_Abort(MPI_COMM_WORLD, 1) - process 17 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 21 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 :application called MPI_Abort(MPI_COMM_WORLD, 1) - process 25 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 81application called MPI_Abort(MPI_COMM_WORLD, 1) - process 29 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 85 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 49application called MPI_Abort(MPI_COMM_WORLD, 1) - process 93 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 :application called MPI_Abort(MPI_COMM_WORLD, 1) - process 33application called MPI_Abort(MPI_COMM_WORLD, 1) - process 57 PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 97 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 37application called MPI_Abort(MPI_COMM_WORLD, 1) - process 61application called MPI_Abort(MPI_COMM_WORLD, 1) - process 89application called MPI_Abort(MPI_COMM_WORLD, 1) - process 105 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 45 PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 109 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 53 PNETCDF not enabled in the build PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 41application called MPI_Abort(MPI_COMM_WORLD, 1) - process 101[0:node8] unexpected disconnect completion event from [17:node7]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 0 pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build pio_support::pio_die:: myrank= -1 : ERROR: nf_mod.F90: 1229 : PNETCDF not enabled in the build PNETCDF not enabled in the buildapplication called MPI_Abort(MPI_COMM_WORLD, 1) - process 113application called MPI_Abort(MPI_COMM_WORLD, 1) - process 117application called MPI_Abort(MPI_COMM_WORLD, 1) - process 121application called MPI_Abort(MPI_COMM_WORLD, 1) - process 125[16:node7] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 16[96:node2] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0[32:node6] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 32internal ABORT - process 96[48:node5] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 48[80:node3] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 80[64:node4] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0application called MPI_Abort(MPI_COMM_WORLD, 1) - process 65application called MPI_Abort(MPI_COMM_WORLD, 1) - process 69application called MPI_Abort(MPI_COMM_WORLD, 1) - process 73application called MPI_Abort(MPI_COMM_WORLD, 1) - process 77internal ABORT - process 64[112:node1] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 112[95:node3] unexpected disconnect completion event from [0:node8]Assertion failed in file ../../dapl_conn_rc.c at line 1179: 0internal ABORT - process 95.......... How to enable PNETCDF in the build? And what exactly is the configuration in env_run.xml for running cesm? (PFA env_run.xml and Macros) Thanks.