cannot import name aead (open ssl error)

[Srinivasulu Bhupal Laxmi]

Hello,

I've upgraded review board from 2.5.4 to 3.0.17 ReviewBoard on my Cent OS 7 machine. Following steps in https://www.reviewboard.org/docs/manual/3.0/admin/upgrading/upgrading-reviewboard/.

The site is up and running.

But when i try to add a git lab repo. I' m facing below issue. Can anybody help me.

ImportError at /admin/db/scmtools/repository/add/

cannot import name aead

Request Method:	POST
Request URL:	http://xxxxxxxxxx.xx.xx.net/admin/db/scmtools/repository/add/
Django Version:	1.6.11
Exception Type:	ImportError
Exception Value:	cannot import name aead
Exception Location:	/usr/lib/python2.7/site-packages/cryptography-2.9.2-py2.7-linux-x86_64.egg/cryptography/hazmat/backends/openssl/backend.py in <module>, line 26
Python Executable:	/usr/bin/python
Python Version:	2.7.5
Python Path:	['/var/www/reviewboard.com/conf', '/usr/lib/python2.7/site-packages/recaptcha_client-1.0.6-py2.7.egg', '/usr/lib/python2.7/site-packages/Pygments-2.1.3-py2.7.egg', '/usr/lib/python2.7/site-packages/paramiko-2.0.0-py2.7.egg', '/usr/lib/python2.7/site-packages/mimeparse-0.1.3-py2.7.egg', '/usr/lib/python2.7/site-packages/docutils-0.12-py2.7.egg', '/usr/lib/python2.7/site-packages/pyasn1-0.1.9-py2.7.egg', '/usr/lib/python2.7/site-packages/PIL-1.1.6-py2.7-linux-x86_64.egg', '/usr/lib/python2.7/site-packages/feedparser-5.2.1-py2.7.egg', '/usr/lib/python2.7/site-packages/ipaddress-1.0.16-py2.7.egg', '/usr/lib/python2.7/site-packages/setuptools-21.0.0-py2.7.egg', '/usr/lib/python2.7/site-packages/Whoosh-2.7.4-py2.7.egg', '/usr/lib/python2.7/site-packages/pycrypto-2.6.1-py2.7-linux-x86_64.egg', '/usr/lib/python2.7/site-packages/django_haystack-2.4.1-py2.7.egg', '/usr/lib/python2.7/site-packages/pillowfight-0.2-py2.7.egg', '/usr/lib/python2.7/site-packages/futures-3.0.5-py2.7.egg', '/usr/lib/python2.7/site-packages/django_multiselectfield-0.1.3-py2.7.egg', '/usr/lib/python2.7/site-packages/rbintegrations-1.0.1-py2.7.egg', '/usr/lib/python2.7/site-packages/pytz-2020.1-py2.7.egg', '/usr/lib/python2.7/site-packages/pymdown_extensions-3.5-py2.7.egg', '/usr/lib/python2.7/site-packages/Markdown-2.6.11-py2.7.egg', '/usr/lib/python2.7/site-packages/Djblets-1.0.12-py2.7.egg', '/usr/lib/python2.7/site-packages/django_evolution-0.7.8-py2.7.egg', '/usr/lib/python2.7/site-packages/django_oauth_toolkit-0.9.0-py2.7.egg', '/usr/lib/python2.7/site-packages/django_cors_headers-1.1.0-py2.7.egg', '/usr/lib/python2.7/site-packages/cryptography-2.9.2-py2.7-linux-x86_64.egg', '/usr/lib/python2.7/site-packages/PyYAML-5.3.1-py2.7-linux-x86_64.egg', '/usr/lib/python2.7/site-packages/asana-0.10.0-py2.7.egg', '/usr/lib/python2.7/site-packages/django_pipeline-1.6.14-py2.7.egg', '/usr/lib/python2.7/site-packages/dnspython-1.16.0-py2.7.egg', '/usr/lib/python2.7/site-packages/publicsuffix-1.1.1-py2.7.egg', '/usr/lib/python2.7/site-packages/oauthlib-1.0.1-py2.7.egg', '/usr/lib/python2.7/site-packages/cffi-1.14.0-py2.7-linux-x86_64.egg', '/usr/lib/python2.7/site-packages/requests-2.23.0-py2.7.egg', '/usr/lib/python2.7/site-packages/Django-1.6.11-py2.7.egg', '/usr/lib/python2.7/site-packages/ReviewBoard-3.0.17-py2.7.egg', '/usr/lib/python2.7/site-packages/requests_oauthlib-1.0.0-py2.7.egg', '/usr/lib/python2.7/site-packages/django_braces-1.13.0-py2.7.egg', '/usr/lib/python2.7/site-packages/certifi-2020.4.5.1-py2.7.egg', '/usr/lib/python2.7/site-packages/urllib3-1.25.9-py2.7.egg', '/usr/lib/python2.7/site-packages/idna-2.9-py2.7.egg', '/usr/lib/python2.7/site-packages/chardet-3.0.4-py2.7.egg', '/usr/lib64/python27.zip', '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages', '/usr/lib64/python2.7/site-packages/gtk-2.0', '/usr/lib/python2.7/site-packages']
Server time:	Fri, 1 May 2020 13:23:49 +0000

[Christian Hammond]

Sounds like something is wrong or missing from your Python cryptography package. Make sure that you don't have a RPM/Debian/etc. package installed for this alongside the Python package. You'll want the Python version only. If you have both, there may be an issue looking up certain modules from the wrong copy.

Christian

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