从https://www.odoo.yenthevg.com/installing-odoo-12-enterprise-ubuntu/在Ubuntu 16.04中安装Odoo 12社区之后

我遇到以下错误：

Traceback (most recent call last):
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo-bin",line 5,in <module>
    import odoo
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo/__init__.py",line 89,in <module>
    from . import modules
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo/modules/__init__.py",line 8,in <module>
    from . import db,graph,loading,migration,module,registry
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo/modules/graph.py",line 10,in <module>
    import odoo.tools as tools
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo/tools/__init__.py",in <module>
    from .config import config
  File "/home/odoodev/NewOdoo12e/odoo_12.0+e.latest_all/data/usr/lib/python3/dist-packages/odoo/tools/config.py",line 18,in <module>
    from passlib.context import CryptContext
  File "/usr/local/lib/python3.5/dist-packages/passlib/context.py",line 20,in <module>
    from passlib.registry import get_crypt_handler,_validate_handler_name
  File "/usr/local/lib/python3.5/dist-packages/passlib/registry.py",line 11,in <module>
    from passlib.utils import is_crypt_handler
  File "/usr/local/lib/python3.5/dist-packages/passlib/utils/__init__.py",line 32,in <module>
    from passlib.utils.compat import add_doc,b,bytes,join_bytes,join_byte_values,\
ImportError: cannot import name 'b'

我已经拥有Odoo 12 Enterprise版本，但是在安装Odoo 12 Community之后，在Odoo 12 Enterprise中也出现了相同的错误。