I have had django running with mod_python for awhile now but today I get the following error

MOD_PYTHON ERROR

ProcessId:      4551
Interpreter:    'thatch'

ServerName:     'thatch'
DocumentRoot:   '/var/www/thatch'

URI:            '/'
Location:       '/'
Directory:      None
Filename:       '/var/www/thatch/'
PathInfo:       ''

Phase:          'PythonHandler'
Handler:        'django.core.handlers.modpython'

Traceback (most recent call last):

  File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1537, in HandlerDispatch
    default=default_handler, arg=req, silent=hlist.silent)

  File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1202, in _process_target
    module = import_module(module_name, path=path)

  File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 304, in import_module
    return __import__(module_name, {}, {}, ['*'])

ImportError: No module named django.core.handlers.modpython

This is my virtual host configuration

<VirtualHost *:80>
  ServerName  thatch

  DocumentRoot /var/www/thatch

  <Location "/">
    SetHandler python-program
    PythonPath "['/var/www/thatch'] + sys.path"
    PythonHandler django.core.handlers.modpython
    SetEnv DJANGO_SETTINGS_MODULE thatch.settings
    PythonOption django.root /var/www/thatch
    PythonDebug On
  </Location>

  <Location "/media">
    SetHandler None
  </Location>

  <LocationMatch "\.(jpg|gif|png|css|js)$">
    SetHandler None
  </LocationMatch>

</VirtualHost>

Any ideas why this is happening?