AttributeError: Values instance has no attribute 'tab_width'

[multimeric]

When using sphinx-argparse, in Sphinx versions 1.7 and above, I get the following exception on build:

Exception occurred:
  File "/home/michael/Programming/GenovicAnalysis/venv/local/lib/python2.7/site-packages/docutils/parsers/rst/__init__.py", line 189, in parse
    inputstring, tab_width=document.settings.tab_width,
AttributeError: Values instance has no attribute 'tab_width'
The full traceback has been saved in /tmp/sphinx-err-Xwi3_K.log, if you want to report the issue to the developers.

This goes away if I downgrade Sphinx to 1.6.X, or if I remove the 'sphinxarg.ext' line from my extensions, so it's obviously caused by this module.

[multimeric]

Full traceback: sphinx-err-Xwi3_K.log

[dpryan79]

You'll need to post the file that's being rendered, this appears to be an issue in it rather than sphinx-argparse itself.