Problem running pip install -r requirements.txt

[JBHorne2]

root@sabnzbd:/usr/share/sabnzbdplus/sabnzbd/scripts# pip install -r requirements.txt
Traceback (most recent call last):
File "/usr/bin/pip", line 33, in
sys.exit(load_entry_point('pip==20.3.4', 'console_scripts', 'pip')())
File "/usr/bin/pip", line 25, in importlib_load_entry_point
return next(matches).load()
File "/usr/lib/python3.9/importlib/metadata.py", line 77, in load
module = import_module(match.group('module'))
File "/usr/lib/python3.9/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1030, in _gcd_import
File "", line 1007, in _find_and_load
File "", line 986, in _find_and_load_unlocked
File "", line 680, in _load_unlocked
File "", line 790, in exec_module
File "", line 228, in _call_with_frames_removed
File "/usr/lib/python3/dist-packages/pip/_internal/cli/main.py", line 10, in
from pip._internal.cli.autocompletion import autocomplete
File "/usr/lib/python3/dist-packages/pip/_internal/cli/autocompletion.py", line 9, in
from pip._internal.cli.main_parser import create_main_parser
File "/usr/lib/python3/dist-packages/pip/_internal/cli/main_parser.py", line 7, in
from pip._internal.cli import cmdoptions
File "/usr/lib/python3/dist-packages/pip/_internal/cli/cmdoptions.py", line 23, in
from pip._vendor.packaging.utils import canonicalize_name
File "/usr/lib/python3/dist-packages/pip/_vendor/init.py", line 94, in
vendored("requests.packages.urllib3.contrib.pyopenssl")
File "/usr/lib/python3/dist-packages/pip/_vendor/init.py", line 36, in vendored
import(modulename, globals(), locals(), level=0)
File "", line 1007, in _find_and_load
File "", line 986, in _find_and_load_unlocked
File "", line 664, in _load_unlocked
File "", line 627, in _load_backward_compatible
File "", line 259, in load_module
File "/usr/share/python-wheels/urllib3-1.26.5-py2.py3-none-any.whl/urllib3/contrib/pyopenssl.py", line 50, in
File "/usr/lib/python3/dist-packages/OpenSSL/init.py", line 8, in
from OpenSSL import crypto, SSL
File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 1556, in
class X509StoreFlags(object):
File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 1577, in X509StoreFlags
CB_ISSUER_CHECK = _lib.X509_V_FLAG_CB_ISSUER_CHECK
AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK'
root@sabnzbd:/usr/share/sabnzbdplus/sabnzbd/scripts#

[JBHorne2]

Fixed this by running (sudo if necessary):
apt remove python3-pip
apt install python3-pip