Traceback (most recent call last):
File "/Users/kf/miniconda3/envs/pymol/bin/csubst", line 313, in <module>
args.handler(args)
File "/Users/kf/miniconda3/envs/pymol/bin/csubst", line 34, in command_site
main_site(g)
File "/Users/kf/miniconda3/envs/pymol/lib/python3.8/site-packages/csubst/main_site.py", line 764, in main_site
parser_pymol.write_pymol_session(df=df, g=g)
File "/Users/kf/miniconda3/envs/pymol/lib/python3.8/site-packages/csubst/parser_pymol.py", line 262, in write_pymol_session
mask_subunit(g)
File "/Users/kf/miniconda3/envs/pymol/lib/python3.8/site-packages/csubst/parser_pymol.py", line 148, in mask_subunit
g = calc_aa_identity(g)
File "/Users/kf/miniconda3/envs/pymol/lib/python3.8/site-packages/csubst/parser_pymol.py", line 136, in calc_aa_identity
aa_start = min(alphabet_sites)
ValueError: min() arg is an empty sequence