Tox execution failure

Traceback (most recent call last):
 File "../../../tmp/v/coala/bin/nodeenv", line 10, in <module>
 sys.exit(main())
 File "/tmp/v/coala/lib/python3.5/site-packages/nodeenv.py", line 1067, in main
 opt.node = get_last_stable_node_version()
 File "/tmp/v/coala/lib/python3.5/site-packages/nodeenv.py", line 997, in get_last_stable_node_version
 response = urlopen('https://%s/dist/latest/' % src_domain)
 File "/tmp/v/coala/lib/python3.5/site-packages/nodeenv.py", line 564, in urlopen
 return urllib2.urlopen(req)
 File "/usr/lib/python3.5/urllib/request.py", line 163, in urlopen
 return opener.open(url, data, timeout)
 File "/usr/lib/python3.5/urllib/request.py", line 466, in open
 response = self._open(req, data)
 File "/usr/lib/python3.5/urllib/request.py", line 484, in _open
 '_open', req)
 File "/usr/lib/python3.5/urllib/request.py", line 444, in _call_chain
 result = func(*args)
 File "/usr/lib/python3.5/urllib/request.py", line 1297, in https_open
 context=self._context, check_hostname=self._check_hostname)
 File "/usr/lib/python3.5/urllib/request.py", line 1256, in do_open
 raise URLError(err)
urllib.error.URLError: <urlopen error [Errno 101] Network is unreachable>
ERROR: InvocationError: '/tmp/v/coala/bin/nodeenv -p'