I worked before but it is not working now…
I do not know why?
Please review what modules are loaded, and what versions of openmpi you are using when running CMAQ.
Use the following commands:
Module avail will show you what modules are available on your server
Module list will show what modules are loaded
If not module is loaded, then load the openmpi using
module load openmpi
Then use the command to verify that you are using the correct version of Open MPI.
If you log out of your compute system, then you will need to reload the module in order to run CMAQ.