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

Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 228, in handler
    return ModPythonHandler()(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 201, in __call__
    response = self.get_response(request)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/base.py", line 128, in get_response
    return self.handle_uncaught_exception(request, resolver, exc_info)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/base.py", line 160, in handle_uncaught_exception
    return callback(request, **param_dict)

  File "/opt/ecosumo/views.py", line 152, in server_error
    email.send()

  File "/usr/lib/python2.4/site-packages/django/core/mail.py", line 275, in send
    return self.get_connection(fail_silently).send_messages([self])

  File "/usr/lib/python2.4/site-packages/django/core/mail.py", line 172, in send_messages
    sent = self._send(message)

  File "/usr/lib/python2.4/site-packages/django/core/mail.py", line 186, in _send
    email_message.message().as_string())

  File "/usr/lib/python2.4/site-packages/django/core/mail.py", line 249, in message
    msg['To'] = ', '.join(self.to)

TypeError: sequence item 0: expected string, tuple found