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

[admin]

How to Reproduce

While doing a GET operation on /downloads, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{}

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36

System Information

Trac	1.1.6
Babel	2.2.0
Docutils	0.12
FullBlog	0.1.5
Genshi	0.7 (without speedups)
mod_wsgi	3.3 (WSGIProcessGroup WSGIApplicationGroup %{GLOBAL})
pysqlite	2.6.0
Python	2.7.4 (default, Apr 6 2013, 19:54:46) [MSC v.1500 32 bit (Intel)]
pytz	2016.3
setuptools	20.3.1
SQLite	3.6.21
Subversion	1.7.9 (r1462340)
jQuery	1.8.3
jQuery UI	1.9.2
jQuery Timepicker	1.1.1

Enabled Plugins

pdfredirector	0.4
svnsyncplugin	0.1.2
tracdownloads	0.3dev-r0
tracfullblogplugin	0.1.5

Interface Customization

shared-htdocs
shared-templates
site-htdocs	VGPE.png, game.png, logo.png, pic, theme.css, theme.css3
site-templates

Python Traceback

Traceback (most recent call last):
  File "build\bdist.win32\egg\trac\web\main.py", line 587, in _dispatch_request
    dispatcher.dispatch(req)
  File "build\bdist.win32\egg\trac\web\main.py", line 246, in dispatch
    resp = chosen_handler.process_request(req)
  File "build\bdist.win32\egg\tracdownloads\core.py", line 140, in process_request
    return api.process_downloads(context) + (None,)
  File "build\bdist.win32\egg\tracdownloads\api.py", line 341, in process_downloads
    db = self.env.get_db_cnx()
AttributeError: 'Environment' object has no attribute 'get_db_cnx'

[anonymous]

trac upgrade 1.1.6 version,this is multiple plugins not use

[Jun Omae]

A duplicate of #12479.

Also, Trac 1.1.x is a development releases. We recommend Trac 1.0.x.