method: all-atom-built-in
Traceback (most recent call last):
  File "/home/ubuntu/miniconda3/bin/rna_calc_rmsd.py", line 7, in <module>
    exec(compile(f.read(), __file__, 'exec'))
  File "/home/ubuntu/rna-tools/rna_tools/tools/rna_calc_rmsd/rna_calc_rmsd.py", line 301, in <module>
    target_selection = select_pdb_fragment(args.target_selection)
  File "/home/ubuntu/rna-tools/rna_tools/tools/extra_functions/select_fragment.py", line 40, in select_pdb_fragment
    if chain_curr in selection:
UnboundLocalError: local variable 'chain_curr' referenced before assignment
DONE!