An error from gff_make_annotation

[huangwb8]

when I run

gff_make_annotation ./ ./gff --flanking-rule commonshortest --genome-label hg38

There are some errors:

/data/reference/AlternativeEventAnnotations/hg38/gff --flanking-rule commonshortest --genome-label hg38
Traceback (most recent call last):
  File "/home/huangwb8/Downloads/conda/location/envs/rna-seq/bin/gff_make_annotation", line 11, in <module>
    load_entry_point('rnaseqlib==0.1', 'console_scripts', 'gff_make_annotation')()
  File "/home/huangwb8/Downloads/conda/location/envs/rna-seq/lib/python2.7/site-packages/pkg_resources/__init__.py", line 489, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/home/huangwb8/Downloads/conda/location/envs/rna-seq/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2851, in load_entry_point
    raise ImportError("Entry point %r not found" % ((group, name),))
ImportError: Entry point ('console_scripts', 'gff_make_annotation') not found

It seemed that there were some python version problems, but I don't know how to solve it.
Would you give some suggestions?