getting error in keystone

Question

while Populate the Identity service database :-su -s /bin/sh -c "keystone-manage db_sync" keystone

its giving below error

 File "/bin/keystone-manage", line 11, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/keystone/cmd/manage.py", line 44, in main
    cli.main(argv=sys.argv, config_files=config_files)
  File "/usr/lib/python2.7/site-packages/keystone/cmd/cli.py", line 1345, in main
    default_config_files=config_files)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2502, in __call__
    else sys.argv[1:])
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 3166, in _parse_cli_opts
    return self._parse_config_files()
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 3183, in _parse_config_files
    ConfigParser._parse_file(config_file, namespace)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 1950, in _parse_file
    raise ConfigFileParseError(pe.filename, str(pe))
oslo_config.cfg.ConfigFileParseError: Failed to parse /etc/keystone/keystone.conf: at /etc/keystone/keystone.conf:105, No ':' or '=' found in assignment: 'i# If set to true, strict password length checking is performed for password'