Devstack Failure stacktrace

gistfile1.txt

+ cd /opt/stack/requirements
+ python update.py /opt/stack/keystone
Traceback (most recent call last):
  File "update.py", line 273, in <module>
    main(options, args)
  File "update.py", line 258, in main
    _copy_requires(options.suffix, options.softupdate, args[0])
  File "update.py", line 219, in _copy_requires
    source_reqs = _parse_reqs('global-requirements.txt')
  File "update.py", line 140, in _parse_reqs
    reqs[_parse_pip(pip)] = pip
  File "update.py", line 101, in _parse_pip
    elif install_require.url:
AttributeError: 'InstallRequirement' object has no attribute 'url'