I need your help Stage gen_be_diags failed with error 2

[I3lade]

i run gen_be and run Stage4 stop show Stage gen_be_diags failed with error 2
export START_DATE=2021040512 # the first perturbation valid date
export END_DATE=2021040600 # the last perturbation valid date
export NUM_LEVELS=50 # = bottom_top = e_vert - 1

Can anyone recommend me? Thanks.

 

[I3lade]

if i set namelist.input e_vert = 50, and run gen_be Should I set export NUM_LEVELS=50 or 49 # = bottom_top = e_vert - 1