W0510 18:15:58.257334 22809 pailgun_service.py:69] encountered exception during SchedulerService.get_build_graph():
Traceback (most recent call last):
  File "/Users/kwilson/dev/pants/src/python/pants/pantsd/service/pailgun_service.py", line 65, in runner_factory
    build_graph = self._scheduler_service.get_build_graph(spec_roots)
  File "/Users/kwilson/dev/pants/src/python/pants/pantsd/service/scheduler_service.py", line 87, in get_build_graph
    for _ in graph.inject_specs_closure(spec_roots):  # Ensure the entire generator is unrolled.
  File "/Users/kwilson/dev/pants/src/python/pants/engine/legacy/graph.py", line 167, in inject_specs_closure
    for address in self._inject(specs):
  File "/Users/kwilson/dev/pants/src/python/pants/engine/legacy/graph.py", line 178, in _inject
    for address in self._index(request.roots):
  File "/Users/kwilson/dev/pants/src/python/pants/engine/legacy/graph.py", line 64, in _index
    'Build graph construction failed for {}:\n  {}'.format(node.subject, state.exc))
AddressLookupError: Build graph construction failed for DescendantAddresses(directory=u''):
  No source of explicit dependency SelectNode(subject=(PathGlobs(ftype=<class 'pants.engine.selectors.Collection(<class 'pants.engine.fs.File'>)'>, dependencies=(PathLiteral(ftype=<class 'pants.engine.selectors.Collection(<class 'pants.engine.fs.File'>)'>, directory=u'examples/src/java/org/pantsbuild/example/hello/main/config', remainder=u'*'),)), PathGlobs(ftype=<class 'pants.engine.selectors.Collection(<class 'pants.engine.fs.File'>)'>, dependencies=())), product=<class 'pants.engine.selectors.Collection(<class 'pants.engine.fs.FileContent'>)'>, variants=None, variant_key=None)