AttributeError: 'Environment' object has no attribute 'get_db_cnx'

[tracAdmin]

How to Reproduce

While doing a GET operation on /admin/accounts/users, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'cat_id': u'accounts', 'panel_id': u'users', 'path_info': None}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/20100101 Firefox/54.0

System Information

Trac	1.2
Babel	2.4.0 (translations unavailable)
Docutils	0.13.1
Genshi	0.7 (with speedups)
mod_wsgi	4.5.13 (WSGIProcessGroup WSGIApplicationGroup trac.sample.com.au)
psycopg2	2.7.3
Pygments	2.2.0
Python	2.7.13 (default, Jun 26 2017, 10:20:05) [GCC 7.1.1 20170622 (Red Hat 7.1.1-3)]
pytz	2017.2
setuptools	36.2.4
jQuery	1.11.3
jQuery UI	1.11.4
jQuery Timepicker	1.5.5

Enabled Plugins

TracAccountManager

0.4.4

Interface Customization

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/trac/web/main.py", line 613, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.7/site-packages/trac/web/main.py", line 253, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.7/site-packages/trac/admin/web_ui.py", line 108, in process_request
    provider.render_admin_panel(req, cat_id, panel_id, path_info)
  File "build/bdist.linux-x86_64/egg/acct_mgr/admin.py", line 204, in render_admin_panel
    return self._do_users(req)
  File "build/bdist.linux-x86_64/egg/acct_mgr/admin.py", line 449, in _do_users
    data['accounts'] = fetch_user_data(env, req)
  File "build/bdist.linux-x86_64/egg/acct_mgr/admin.py", line 73, in fetch_user_data
    authenticated=None).iteritems():
  File "build/bdist.linux-x86_64/egg/acct_mgr/model.py", line 123, in get_user_attribute
    db = _get_db(env, db)
  File "build/bdist.linux-x86_64/egg/acct_mgr/model.py", line 292, in _get_db
    return db or env.get_db_cnx()
AttributeError: 'Environment' object has no attribute 'get_db_cnx'

[Jun Omae]

A duplicate of #11915.