dfab: /tp/hello_task $ ./pants .
Traceback (most recent call last):
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 140, in load_backend
    module = importlib.import_module(backend_module)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/private/tmp/tp/hello_task/plugins/hello_world/register.py", line 2, in <module>
    from hello_world.target import HelloWorld
  File "/private/tmp/tp/hello_task/plugins/hello_world/target/HelloWorld.py", line 1, in <module>
    import pants.task.task.Task
ImportError: No module named Task
Exception caught: (<class 'pants.base.exceptions.BackendConfigurationError'>)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/0.0.67/bin/pants", line 11, in <module>
    sys.exit(main())
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/pants_exe.py", line 44, in main
    PantsRunner(exiter).run()
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/pants_runner.py", line 53, in run
    options_bootstrapper=options_bootstrapper)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/pants_runner.py", line 43, in _run
    return LocalPantsRunner(exiter, args, env, options_bootstrapper=options_bootstrapper).run()
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 49, in run
    self._maybe_profiled(self._run)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 46, in _maybe_profiled
    runner()
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 55, in _run
    options, build_config = OptionsInitializer(options_bootstrapper, exiter=self._exiter).setup()
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/goal_runner.py", line 128, in setup
    return self._setup_options(self._options_bootstrapper, self._working_set)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/goal_runner.py", line 102, in _setup_options
    build_configuration = load_plugins_and_backends(plugins, working_set, backend_packages)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 36, in load_plugins_and_backends
    load_build_configuration_from_source(build_configuration, additional_backends=backends or [])
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 126, in load_build_configuration_from_source
    load_backend(build_configuration, backend_package)
  File "/Users/dfabulich/.cache/pants/setup/bootstrap/pants.El0DVv/install/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 144, in load_backend
    .format(backend=backend_module, error=e))

Exception message: Failed to load the hello_world.register backend: No module named Task