AttributeError: Cannot find an implementation of the "IRequestHandler" interface named "TagsWikiModule". Please update the option trac.default_handler in trac.ini.

[kris.wallsmith@…]

This error occurs when accessing / but not when accessing /wiki/. Kris

How to Reproduce

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

(please provide additional details here)

User Agent was: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_2; en-us) AppleWebKit/525.18 (KHTML, like Gecko) Version/3.1.1 Safari/525.18

System Information

Trac	0.11dev-r6914
Python	2.4.3 (#1, Mar 14 2007, 18:51:08) [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)]
setuptools	0.6c6
SQLite	3.3.6
pysqlite	2.3.3
Genshi	0.5dev-r845
mod_python	3.2.8
jQuery:	1.2.3

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6914-py2.4.egg/trac/web/main.py", line 417, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6914-py2.4.egg/trac/web/main.py", line 169, in dispatch
    chosen_handler = self.default_handler
  File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6914-py2.4.egg/trac/config.py", line 462, in __get__
    raise AttributeError('Cannot find an implementation of the "%s" '
AttributeError: Cannot find an implementation of the "IRequestHandler" interface named "TagsWikiModule".  Please update the option trac.default_handler in trac.ini.

[kris.wallsmith@…]

The error went away after I deleted the trac.default_handler line in trac.ini. The error also occurs when that value is set to wiki.

[Tim Hatch]

The default should be WikiModule, not just wiki. It looks like you're trying to use the tags plugin. Is it enabled?

[sid]

Duplicate of #4135. This is a misconfiguration of the Tags plugin. There is also ​th:#1158 that discusses the same issue that might be of interest.