WARN] Ignoring `follow_links=True` kwarg on glob. Default behavior is to follow all links.
From cffi callback <function extern_key_for at 0x25b5d70>:
Traceback (most recent call last):
  File "/home/kwilson/dev/pants/src/python/pants/engine/subsystem/native.py", line 222, in extern_key_for
    return c.to_key(c.from_value(val))
  File "/home/kwilson/dev/pants/src/python/pants/engine/subsystem/native.py", line 492, in to_key
    return Key(self.put(obj), type_id)
  File "/home/kwilson/dev/pants/src/python/pants/engine/subsystem/native.py", line 482, in put
    return self._object_id_map.put(obj)
  File "/home/kwilson/dev/pants/src/python/pants/engine/subsystem/native.py", line 411, in put
    key = self._objects.put(obj)
  File "/home/kwilson/dev/pants/src/python/pants/engine/storage.py", line 135, in put
    raise SerializationError('Failed to pickle {}: {}'.format(obj, e), e)
pants.engine.objects.SerializationError: (u"Failed to pickle BundlesField(address=BuildFileAddress(science/abuse/BUILD, spam-reports), bundles=[BundleAdaptor(fileset=<pants.engine.legacy.structs.RGlobs object at 0x7f9a346ca5d0>, relative_to='spam_reports'), BundleAdaptor(fileset=<pants.engine.legacy.structs.RGlobs object at 0x7f9a346ca650>, relative_to='spam_reports'), BundleAdaptor(fileset=<pants.engine.legacy.structs.RGlobs object at 0x7f9a346ca6d0>, relative_to='common'), BundleAdaptor(fileset=<pants.engine.legacy.structs.RGlobs object at 0x7f9a346ca750>, relative_to='config'), BundleAdaptor(fileset=<pants.engine.legacy.structs.RGlobs object at 0x7f9a346ca7d0>, mapper=<function mapper at 0x7f99e864bcf8>)], filespecs_list=[{u'exclude': [], u'globs': [u'spam_reports/scripts/**/*']}, {u'exclude': [], u'globs': [u'spam_reports/config/**/*']}, {u'exclude': [], u'globs': [u'common/config/**/*']}, {u'exclude': [], u'globs': [u'config/mesos/**/*']}, {u'exclude': [], u'globs': [u'nsfw/**/*', u'user_spam/**/*']}], path_globs_list=[PathGlobs(include=(u'science/abuse/spam_reports/scripts/**/*',), exclude=()), PathGlobs(include=(u'science/abuse/spam_reports/config/**/*',), exclude=()), PathGlobs(include=(u'science/abuse/common/config/**/*',), exclude=()), PathGlobs(include=(u'science/abuse/config/mesos/**/*',), exclude=()), PathGlobs(include=(u'science/abuse/nsfw/**/*', u'science/abuse/user_spam/**/*'), exclude=())]): expected string or Unicode object, NoneType found", TypeError('expected string or Unicode object, NoneType found',))