how to fix error when running rosdep update?

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Hi, I'm trying to install ros indigo on a PC with Ubuntu 14.04. I have been able to install all the packages and initialize rosdep. However, when I run the command rosdep update, I get the following error:

$ rosdep update

reading in sources list data from /etc/ros/rosdep/sources.list.d
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml]:
    nonnumeric port: 'port' (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]:
    nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml]:
    nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml]:
    nonnumeric port: 'port' (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:
    nonnumeric port: 'port'
Query rosdistro index https://raw.githubusercontent.com/ros/rosdistro/master/index.yaml

ERROR: Rosdep experienced an error: nonnumeric port: 'port'
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: 0.11.4

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 136, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 351, in _rosdep_main
    return _no_args_handler(command, parser, options, args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 359, in _no_args_handler
    return command_handlers[command](options)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 545, in command_update
    error_handler=update_error_handler)
  File "/usr/lib/python2.7/dist-packages/rosdep2/sources_list.py", line 463, in update_sources_list
    for dist_name in sorted(get_index().distributions.keys()):
  File "/usr/lib/python2.7/dist-packages/rosdep2/rosdistrohelper.py", line 69, in get_index
    _RDCache.index = rosdistro.get_index(_RDCache.index_url)
  File "/usr/lib/python2.7/dist-packages/rosdistro/__init__.py", line 117, in get_index
    yaml_str = load_url(url)
  File "/usr/lib/python2.7/dist-packages/rosdistro/loader.py", line 48, in load_url
    fh = urlopen(url, timeout=timeout)
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 404, in open
    response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 422, in _open
    '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 1222, in https_open
    return self.do_open(httplib.HTTPSConnection, req)
  File "/usr/lib/python2.7/urllib2.py", line 1153, in do_open
    h = http_class(host, timeout=req.timeout) # will parse host:port
  File "/usr/lib/python2.7/httplib.py", line 1170, in __init__
    source_address)
  File "/usr/lib/python2 ...