UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

[dsiegieda]

using this code:
sourcetracker2 gibbs -i table.txt -m healthy.txt -o healthy/

gave me an error:

Traceback (most recent call last):
  File "/home/lmmis/miniconda3/envs/st2/bin/sourcetracker2", line 8, in <module>
    sys.exit(cli())
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/site-packages/sourcetracker/_cli/gibbs.py", line 140, in gibbs
    sample_metadata_lines = o.readlines()
  File "/home/lmmis/miniconda3/envs/st2/lib/python3.6/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte