Sir,
I am a beginner in RegCM and am getting this error. I am not being able to find any solution.
When i try to run the model using the command mpirun -np 4 ./bin/regcmMPI . I am facing this error. 

sd@gHost:~/regcm/RegCM-4.7.0/REGCM_RUN$ mpirun -np 4 ./bin/regcmMPI test_014.in

  This is RegCM trunk
   SVN Revision: tag-4.7.0 compiled at: data : Nov 11 2019  time: 11:29:40

 : this run start at  : 2019-11-11 20:41:10+0530
 : it is submitted by : sd
 : it is running on   : gHost
 : it is using        :            4   processors
 : in directory       : /home/sd/regcm/RegCM-4.7.0/REGCM_RUN
                       
 CPUS DIM1 =            2
 CPUS DIM2 =            2

 Reading model namelist file
 Using default dynamical parameters.
 Using default hydrostatc parameters.
 Using default cloud parameter.
 -------------- FATAL CALLED ---------------
  Fatal in file: mod_params.F90 at line:     2413
 Error reading SUBEXPARAM
 -------------------------------------------
 mod_params.F90 :     2413:            1
 Abort called by computing node            0 at 2019-11-11 20:41:10.365 +0530
 Execution terminated because of runtime error
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI COMMUNICATOR 3 DUP FROM 0
with errorcode 1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.

--
Saswat Dash
Student of Atmospheric Science
Central University of Rajasthan