loggerhead needs a hard dependency on simplejson

I am running Loggerhead 1.17 on an Ubuntu 8.04 server on Bazaar (bzr) 2.1.1.

When I click on the "View revision" link on a branch, it gives me:

(root)/serf : error

An unexpected error occurred whileproccesing the request:

AttributeError: 'module' object has no attribute 'dumps'

Loggerhead 1.17 is a web-based interface for Bazaar branches

The loggerhead.log file says:

INFO:loggerhead./serf:Rendering ErrorUI: 0.048339128494262695 secs, 2747 bytes
DEBUG:paste.httpserver.ThreadPool:Added task (0 tasks queued)
ERROR:loggerhead./serf: exceptions.AttributeError: 'module' object has no attribute 'dumps'
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/loggerhead/apps/error.py", line 31, in __call__
    return self.application(environ, start_response)
  File "/var/lib/python-support/python2.5/paste/httpexceptions.py", line 632, in __call__
    return self.application(environ, start_response)
  File "/var/lib/python-support/python2.5/paste/deploy/config.py", line 276, in __call__
    return self.app(environ, start_response)
  File "/usr/lib/python2.5/site-packages/loggerhead/apps/transport.py", line 158, in __call__
    return favicon_app(environ, start_response)
  File "/usr/lib/python2.5/site-packages/loggerhead/apps/transport.py", line 118, in __call__
    return self.app_for_bazaar_data(path)(environ, start_response)
  File "/usr/lib/python2.5/site-packages/loggerhead/apps/transport.py", line 124, in __call__
    if path.startswith('/.bzr'):
  File "/usr/lib/python2.5/site-packages/loggerhead/apps/branch.py", line 165, in app
    try:
  File "/usr/lib/python2.5/site-packages/loggerhead/controllers/__init__.py", line 93, in __call__
    vals.update(self.get_values(path, kwargs, headers))
  File "/usr/lib/python2.5/site-packages/loggerhead/controllers/revision_ui.py", line 123, in get_values
    'link_data': simplejson.dumps(link_data),
AttributeError: 'module' object has no attribute 'dumps'
INFO:loggerhead./serf:Getting information for ErrorUI: 0.00052595138549804688 secs
INFO:loggerhead:192.168.0.96 - - [27/May/2010:16:44:44 -0700] "GET /loggerhead/serf/revision/188?start_revid=188 HTTP/1.1" 200 - "http://eng:8080/serf/files" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.3) Gecko/20100423 Ubuntu/10.04 (lucid) Firefox/3.6.3"
INFO:loggerhead./serf:Rendering ErrorUI: 0.048729896545410156 secs, 2747 bytes