Traceback (most recent call last):
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 123, in load_backend
    module = importlib.import_module(backend_module)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/eric/Code/ws-monorepo/build-support/plugins/testplugin/register.py", line 3, in <module>
    from testplugin.targets.setup_terraform import SetupTerraform
  File "/Users/eric/Code/ws-monorepo/build-support/plugins/testplugin/targets/setup_terraform.py", line 1, in <module>
    import boto3
ImportError: No module named boto3
Exception caught: (<class 'pants.base.exceptions.BackendConfigurationError'>)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/bin/pants", line 11, in <module>
    sys.exit(main())
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/pants_exe.py", line 44, in main
    PantsRunner(exiter).run()
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/pants_runner.py", line 57, in run
    options_bootstrapper=options_bootstrapper)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/pants_runner.py", line 46, in _run
    return LocalPantsRunner(exiter, args, env, options_bootstrapper=options_bootstrapper).run()
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 53, in run
    self._maybe_profiled(self._run)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 50, in _maybe_profiled
    runner()
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/local_pants_runner.py", line 59, in _run
    options, build_config = OptionsInitializer(options_bootstrapper, exiter=self._exiter).setup()
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/options_initializer.py", line 174, in setup
    backends)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/options_initializer.py", line 83, in _load_plugins
    return load_backends_and_plugins(plugins, working_set, backend_packages)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 36, in load_backends_and_plugins
    load_build_configuration_from_source(build_configuration, backends)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 109, in load_build_configuration_from_source
    load_backend(build_configuration, backend_package)
  File "/Users/eric/.cache/pants/setup/bootstrap-Darwin-x86_64/1.1.0/lib/python2.7/site-packages/pants/bin/extension_loader.py", line 127, in load_backend
    .format(backend=backend_module, error=e))

Exception message: Failed to load the testplugin.register backend: No module named boto3