hello community I am using super focus for functional assignment of metagenomes, however, every time I run it, this error comes out, what could it be? Or you know another tool for functional assignment

terminate called after throwing an instance of 
'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::bad_lexical_cast> >'
what():  bad lexical cast: source type value could not be interpreted as target
 Aborted (core dumped)
 [2018-09-25 23:49:30,215 - INFO]    Parsing Alignments
  Traceback (most recent call last):
  File "/home/fernado/miniconda3/bin/superfocus", line 11, in <module>
sys.exit(main())
 File "/home/fernado/miniconda3/lib/python3.6/site-packages/superfocus_app/superfocus.py", line 322, in main
  minimum_identity, minimum_alignment, subsystems_translation, aligner)
 File "/home/fernado/miniconda3/lib/python3.6/site-packages/superfocus_app/do_alignment.py", line 171, in 
 parse_alignments
 update_results(results, sample_index, temp_results, normalise, number_sample

I hope you can help me

best