Rosdep update not working

edit

when ran rosdep update command got below error

reading in sources list data from /etc/ros/rosdep/sources.list.d
Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml

ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml]:
    while parsing a flow sequence
  in "<string>", line 6157, column 13:
      opensuse: [yaml-cp
                ^
expected ',' or ']', but got '<stream end>'
  in "<string>", line 6157, column 21:
      opensuse: [yaml-cp
                        ^
Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml
Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml]:
    Failed to download target platform data for gbpdistro:
    Invalid GBP-distro/targets format: missing key: 'type'
Query rosdistro index https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml
Skip end-of-life distro "ardent"
Skip end-of-life distro "bouncy"
Skip end-of-life distro "crystal"
Add distro "dashing"

ERROR: Rosdep experienced an error: Expected file type is 'distribution'
Please go to the rosdep page [1] and file a bug report with the stack trace below.
[1] : http://www.ros.org/wiki/rosdep

rosdep version: 0.19.0

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 144, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 428, in _rosdep_main
    return _no_args_handler(command, parser, options, args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 437, in _no_args_handler
    return command_handlers[command](options)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 649, in command_update
    ros_distro=options.ros_distro)
  File "/usr/lib/python2.7/dist-packages/rosdep2/sources_list.py", line 507, in update_sources_list
    rosdep_data = get_gbprepo_as_rosdep_data(dist_name)
  File "/usr/lib/python2.7/dist-packages/rosdep2/gbpdistro_support.py", line 149, in get_gbprepo_as_rosdep_data
    distro_file = get_release_file(gbpdistro)
  File "/usr/lib/python2.7/dist-packages/rosdep2/rosdistrohelper.py", line 76, in get_release_file
    dist_file = rosdistro.get_distribution_file(get_index(), distro)
  File "/usr/lib/python2.7/dist-packages/rosdistro/__init__.py", line 120, in get_distribution_file
    return create_distribution_file(dist_name, data)
  File "/usr/lib/python2.7/dist-packages/rosdistro/distribution_file.py", line 134, in create_distribution_file
    dist_file = DistributionFile(dist_name, d)
  File "/usr/lib/python2.7/dist-packages/rosdistro/distribution_file.py", line 45, in __init__
    assert 'type' in data, "Expected file type is '%s'" % DistributionFile._type
AssertionError: Expected file type is 'distribution'