Traceback (most recent call last):

 "../mtcars.py", line 2, in <module>
ggplot(data=mtcars, aesthetics=aes('wt', 'mpg', 'qsec') + geom_line())

 "/home/shibbiry/.virtualenvs/ggplot_bug/lib/python3.5/site-packages/ggplot/ggplot.py", line 55, in __init__
self._handle_index()

 "/home/shibbiry/.virtualenvs/ggplot_bug/lib/python3.5/site-packages/ggplot/ggplot.py", line 134, in _handle_index
if '__index__' in self._aes.values():AttributeError: 'geom_line' object has no attribute 'values'
Traceback (most recent call last):

 "/home/johnny/src/beets/beet", line 23, in <module>
beets.ui.main()

 "/home/johnny/src/beets/beets/ui/__init__.py", line 1288, in main
_raw_main(args)

 "/home/johnny/src/beets/beets/ui/__init__.py", line 1275, in _raw_main
subcommand.func(lib, suboptions, subargs)

 "/home/johnny/src/beets/beets/ui/commands.py", line 968, in import_func
import_files(lib, paths, query)

 "/home/johnny/src/beets/beets/ui/commands.py", line 945, in import_files
session.run()

 "/home/johnny/src/beets/beets/importer.py", line 320, in run
pl.run_parallel(QUEUE_SIZE)

 "/home/johnny/src/beets/beets/util/pipeline.py", line 445, in run_parallel
six.reraise(exc_info[0], exc_info[1], exc_info[2])

 "/home/johnny/.local/share/pyenv/versions/3.4.5/lib/python3.4/site-packages/six.py", line 686, in reraise
raise value

 "/home/johnny/src/beets/beets/util/pipeline.py", line 312, in run
out = self.coro.send(msg)

 "/home/johnny/src/beets/beets/util/pipeline.py", line 194, in coro
func(*(args + (task,)))

 "/home/johnny/src/beets/beets/importer.py", line 1264, in lookup_candidates
task.lookup_candidates()

 "/home/johnny/src/beets/beets/importer.py", line 591, in lookup_candidates
autotag.tag_album(self.items, search_ids=self.search_ids)

 "/home/johnny/src/beets/beets/autotag/match.py", line 446, in tag_album
candidates = sorted(candidates.values())TypeError: unorderable types: AlbumInfo() < AlbumInfo()