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Debug Suggestions
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Here are listing a few common bugs from the coupled runs and the solutions for these bugs.

Issues with input/output fields
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There will be issues with the input/output fields when running the coupled model::

  20221102 010103.660 ERROR            PET0 mod_esmf_cpl.F90:154 Object being used before creation  - Passing error in return code
  20221102 010103.660 ERROR            PET0 ATM-TO-OCN:src/addon/NUOPC/src/NUOPC_Connector.F90:4366 Object being used before creation  - Passing error in return code
  20221102 010103.660 ERROR            PET0 NEW_GRID:src/addon/NUOPC/src/NUOPC_Driver.F90:2350 Object being used before creation  - Phase 'IPDv05p6b' Initialize for connectorComp 1 -> 2: ATM-TO-OCN did not return ESMF_SUCCESS
  20221102 010103.660 ERROR            PET0 NEW_GRID:src/addon/NUOPC/src/NUOPC_Driver.F90:1682 Object being used before creation  - Passing error in return code
  20221102 010103.660 ERROR            PET0 NEW_GRID:src/addon/NUOPC/src/NUOPC_Driver.F90:388 Object being used before creation  - Passing error in return code
  20221102 010103.660 ERROR            PET0 mitgcm_wrf.F90:100 Object being used before creation  - Passing error in return code

Here are a few suggestions:

  1. Compare namelist.input and namelist.WRF_IO with the L3C1 case. There might be issues what you did not activate the WRF--ESMF interface or activate the interface for a specific variable.
  2. Check the source code in coupledCode folder and the mitgcm code. There might be issues with the MITgcm input/output.
  3. Check the WRF--ESMF interface source code, especially for Line 79 in installOption_WRF/wrfAO413_shared/ext_esmf_read_field.F90