While Manually Starting the Server

[DonFeraRRi]

dex@abc:~$ python3 /opt/dex/simple/core/odoo-bin --addons=/opt/dex/simple/core/addons/,/opt/dex/simple/backend/ --xmlrpc-port=8069
Traceback (most recent call last):
File "/opt/dex/simple/core/odoo-bin", line 5, in
import odoo
File "/opt/dex/simple/core/odoo/init.py", line 89, in
from . import modules
File "/opt/dex/simple/core/odoo/modules/init.py", line 8, in
from . import db, graph, loading, migration, module, registry
File "/opt/dex/simple/core/odoo/modules/graph.py", line 10, in
import odoo.tools as tools
File "/opt/dex/simple/core/odoo/tools/init.py", line 8, in
from .config import config
File "/opt/dex/simple/core/odoo/tools/config.py", line 18, in
from passlib.context import CryptContext
File "/opt/dex/.local/lib/python3.5/site-packages/passlib/context.py", line 20, in
from passlib.registry import get_crypt_handler, _validate_handler_name
File "/opt/dex/.local/lib/python3.5/site-packages/passlib/registry.py", line 11, in
from passlib.utils import is_crypt_handler
File "/opt/dex/.local/lib/python3.5/site-packages/passlib/utils/init.py", line 32, in
from passlib.utils.compat import add_doc, b, bytes, join_bytes, join_byte_values,
ImportError: cannot import name 'b'

This is what I am getting while trying to start it. Nothing effective foun on google. Tried installing various version of passlib too but hard Luck.

How can I resolve this?