ResourceNotFound: rosbridge_server

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Traceback (most recent call last):
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/__init__.py", line , in main
    p.start()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/parent.py", line , in start
    self._start_infrastructure()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/parent.py", line , in _start_infrastructure
    self._load_config()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/parent.py", line , in _load_config
    roslaunch_strs=self.roslaunch_strs, verbose=self.verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/config.py", line , in load_config_default
    loader.load(f, config, verbose=verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in load
    self._load_launch(launch, ros_config, is_core=core, filename=filename, argv=argv, verbose=verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in _load_launch
    self._recurse_load(ros_config, launch.childNodes, self.root_context, None, is_core, verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in _recurse_load
    val = self._include_tag(tag, context, ros_config, default_machine, is_core, verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in call
    return f(*args, **kwds)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in _include_tag
    default_machine, is_core, verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in _recurse_load
    val = self._include_tag(tag, context, ros_config, default_machine, is_core, verbose)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in call
    return f(*args, **kwds)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in _include_tag
    inc_filename = self.resolve_args(tag.attributes['file'].value, context)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line , in resolve_args
    return substitution_args.resolve_args(args, context=context.resolve_dict, resolve_anon=self.resolve_anon)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line , in resolve_args
    resolved = _resolve_args(resolved, context, resolve_anon, commands)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line , in _resolve_args
    resolved = commands[command](resolved, a, args, context)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line , in _find
    source_path_to_packages=source_path_to_packages)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line , in _find_executable
    full_path = _get_executable_path(rp.get_path(args[]), path)
  File "/usr/lib/python2.7/dist-packages/rospkg/rospack.py", line , in get_path
    raise ResourceNotFound(name, ros_paths=self._ros_paths)
ResourceNotFound: rosbridge_server

sudo apt-get install ros-indigo-rosbridge-server