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.