If you don't find an answer here, there may be some guidance on the High Resolution Discussion Board, where you can also ask a question: https://bb.cgd.ucar.edu/cesm/forums/high-resolution-variable-resolution.163/
(1) ??? error - vertical level
Vertical levels regridded to regular grid. Winter hemisphere altitudes were too low and model crashed. Make sure regridding regrids to levels above the MPAS vertical layer maximum height.
Theta and Rho were blowing up.