ContextualVersionConflict: (cryptography 1.3.1), Requirement.parse('cryptography>=1.3.4'), set(['PyOpenSSL']))

[jtokic]

Error: Let's Encrypt SSL certificate installation failed: Failed letsencrypt execution: Traceback (most recent call last):
File "/usr/local/psa/var/modules/letsencrypt/venv/bin/certbot", line 11, in
sys.exit(main())
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/certbot/main.py", line 700, in main
plugins = plugins_disco.PluginsRegistry.find_all()
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/certbot/plugins/disco.py", line 174, in find_all
plugin_ep = PluginEntryPoint(entry_point)
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/certbot/plugins/disco.py", line 33, in init
self.plugin_cls = entry_point.load()
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/pkg_resources/init.py", line 2280, in load
self.require(_args, *_kwargs)
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/pkg_resources/init.py", line 2297, in require
items = working_set.resolve(reqs, env, installer)
File "/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages/pkg_resources/init.py", line 858, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
ContextualVersionConflict: (cryptography 1.3.1 (/usr/local/psa/var/modules/letsencrypt/venv.sIXBk/lib/python2.7/site-packages), Requirement.parse('cryptography>=1.3.4'), set(['PyOpenSSL']))

[mossmane]

Got exactly the same problem i tried every known solution but it always failed

[Lloyd1978]

Yeah +1, I installed on a clients server earlier got the same error. Ubuntu 14.04.5 LTS

[dailyhypervisor]

Same here. I installed it earlier this morning and am seeing the same issue on Centos 6.8. There error is verbatim what is posted. I have searched just about everything I can think of and cannot find any solution that works. It appears to be an issue with the cryptography, but one of the solutions I have found solve the issue. Please help......

[dailyhypervisor]

This is the error I see when trying to upgrade the cryptography:

error: command 'gcc' failed with exit status 1

---

Failed building wheel for cryptography
Running setup.py clean for cryptography
Failed to build cryptography
Installing collected packages: cffi, cryptography
Found existing installation: cffi 1.5.2
Uninstalling cffi-1.5.2:
Successfully uninstalled cffi-1.5.2
Found existing installation: cryptography 1.3.1
Uninstalling cryptography-1.3.1:
Successfully uninstalled cryptography-1.3.1
Running setup.py install for cryptography ... error
Complete output from command /usr/local/psa/var/modules/letsencrypt/venv.W9Q9i/bin/python -u -c "import setuptools, tokenize;file='/tmp/pip-build-kqimzt/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(file).read().replace('\r\n', '\n'), file, 'exec'))" install --record /tmp/pip-iN67yf-record/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/psa/var/modules/letsencrypt/venv.W9Q9i/include/site/python2.7/cryptography:

[dailyhypervisor]

Plesk 12.5.30, CentOS 6.8, Python 2.6.6

[AndreasBeyer]

Same Problem
12.5.30 Update #44, Ubuntu 14.04.5‬, Python 2.7.6

[xgin]

The 3d-party package PyOpenSSL has been released: https://pyopenssl.readthedocs.io/en/stable/changelog.html#id1

Workaround to install the previous version:

/usr/local/psa/var/modules/letsencrypt/venv/bin/pip install pyopenssl==16.0.0