wsgi:error AttributeError: module 'pkg_resources' has no attribute 'resource_filename'

Hella,

I'm trying to install pgAdmin on Redhat and end up with below error,

Wed May 06 00:53:35.157756 2020] [wsgi:error] [pid 6973] mod_wsgi (pid=6973): Failed to exec Python script file '/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.wsgi'.
[Wed May 06 00:53:35.157820 2020] [wsgi:error] [pid 6973] mod_wsgi (pid=6973): Exception occurred processing WSGI script '/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.wsgi'.
[Wed May 06 00:53:35.157959 2020] [wsgi:error] [pid 6973] Traceback (most recent call last):
[Wed May 06 00:53:35.158001 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.wsgi", line 36, in <module>
[Wed May 06 00:53:35.158009 2020] [wsgi:error] [pid 6973] from pgAdmin4 import app as application
[Wed May 06 00:53:35.158018 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.py", line 109, in <module>
[Wed May 06 00:53:35.158023 2020] [wsgi:error] [pid 6973] app = create_app()
[Wed May 06 00:53:35.158031 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgadmin/__init__.py", line 379, in create_app
[Wed May 06 00:53:35.158036 2020] [wsgi:error] [pid 6973] security.init_app(app, user_datastore)
[Wed May 06 00:53:35.158043 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask_security/core.py", line 503, in init_app
[Wed May 06 00:53:35.158048 2020] [wsgi:error] [pid 6973] anonymous_user=anonymous_user)
[Wed May 06 00:53:35.158055 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask_security/core.py", line 332, in _get_state
[Wed May 06 00:53:35.158060 2020] [wsgi:error] [pid 6973] i18n_domain=_get_i18n_domain(app),
[Wed May 06 00:53:35.158067 2020] [wsgi:error] [pid 6973] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask_security/core.py", line 303, in _get_i18n_domain
[Wed May 06 00:53:35.158073 2020] [wsgi:error] [pid 6973] pkg_resources.resource_filename('flask_security', 'translations'),
[Wed May 06 00:53:35.158089 2020] [wsgi:error] [pid 6973] AttributeError: module 'pkg_resources' has no attribute 'resource_filename'

when I ran get_i18n_domain(app) fund in python console individually running fine, I wondered by it is throwing error while running app in web-browser.

Is it a known issue or any solution to fix it?

pgAdmin4-4.21
Server version: Apache/2.4.6 (Red Hat Enterprise Linux)

Thanks,
Rj