EME uses FDE to solve modes. FDE uses uniform mesh, which is different from FDTD. The two methods you should are similar to specify the mesh size. The difference is, FDE uses the specified uniform mesh in the whol simulation region, whereas the override uses the specified mesh size in its own region. Usually override mesh is used to make finer mesh in a small region.
The "job error" may be just temporary at that moment, or the file is crashed. Please open it again and see if still crashing. You may need to rebuild the simulation file from a new project.
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