This is error message that I received.
Traceback (most recent call last):
File "/usr/bin/protonvpn", line 6, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 3250, in <module>
@_call_aside
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 3234, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 3263, in initialize_master_working_set
working_set = WorkingSet.build_master()
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 583, in _build_master
ws.require(requires)
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 900, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3.7/site-packages/pkg_resources/init.py", line 786, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'jinja2' distribution was not found and is required by protonvpn-cli