Mod_python error: "PythonHandler django.core.handlers.modpython"

Traceback (most recent call last):

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/core/handlers/modpython.py", line 177, in handler
    return ModPythonHandler()(req)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/core/handlers/modpython.py", line 150, in __call__
    response = self.get_response(request)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/core/handlers/base.py", line 59, in get_response
    response = middleware_method(request)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/middleware/cache.py", line 55, in process_request
    cache_key = get_cache_key(request, self.key_prefix)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/utils/cache.py", line 134, in get_cache_key
    headerlist = cache.get(cache_key, None)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/Django-0.95-py2.4.egg/django/django/core/cache/backends/memcached.py", line 16, in get
    val = self._cache.get(key)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/memcache.py", line 342, in get
    check_key(key)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/memcache.py", line 580, in check_key
    raise Client.MemcachedKeyCharacterError, "Control characters not allowed"

MemcachedKeyCharacterError: Control characters not allowed