http://logs.openstack.org/36/465436/4/check/gate-manila-specs-docs-ubuntu-xenial/b5244bc/console.html#_2017-05-18_02_56_08_812683
2017-05-18 02:56:08.711677 | preparing documents... done
2017-05-18 02:56:08.712041 | writing output... [ 3%] contributing
2017-05-18 02:56:08.811019 |
2017-05-18 02:56:08.811113 | Exception occurred:
2017-05-18 02:56:08.812570 | File "/home/jenkins/workspace/gate-manila-specs-docs-ubuntu-xenial/.tox/venv/local/lib/python2.7/site-packages/sphinx/themes/basic/../basic/layout.html", line 108, in template
2017-05-18 02:56:08.812638 | {%- for css in css_files %}
2017-05-18 02:56:08.812683 | TypeError: 'NoneType' object is not iterable
2017-05-18 02:56:08.814946 | The full traceback has been saved in /tmp/sphinx-err-22VVJl.log, if you want to report the issue to the developers.
2017-05-18 02:56:08.815099 | Please also report this if it was a user error, so that a better error message can be provided next time.
2017-05-18 02:56:08.815208 | A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
2017-05-18 02:56:08.895474 | ERROR: InvocationError: '/home/jenkins/workspace/gate-manila-specs-docs-ubuntu-xenial/.tox/venv/bin/python setup.py build_sphinx'
2017-05-18 02:56:08.895668 | ___________________________________ summary ____________________________________
2017-05-18 02:56:08.895694 | ERROR: venv: commands failed
Actually, according to [1], the version introducing this error is sphinx 1.6.1
[1] http:// logs.openstack. org/36/ 465436/ 4/check/ gate-manila- specs-docs- ubuntu- xenial/ b5244bc/ tox/venv- 1.log