readr/- at master · nik-john/readr · GitHub

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Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 211, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/site-packages/pip/commands/install.py", line 282, in run
    wheel_cache
  File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 272, in populate_requirement_set
    wheel_cache=wheel_cache
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 213, in from_line
    wheel_cache=wheel_cache, constraint=constraint)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 67, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "/usr/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2980, in parse
    reqs = list(parse_requirements(s))
  File "/usr/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2924, in parse_requirements
    "version spec")
  File "/usr/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2889, in scan_list
    raise RequirementParseError(msg, line, "at", line[p:])
RequirementParseError: Expected version spec in gunicornweb: at :