[closed] 500 Server Internal Error

Hi! There is a error - when I try to edit some question\\answer and press "Save Edit" instead of seeing edited post I see 500 Server Internal Error.

In the django log there are these strings:

forum/views/meta.py TIME: 2011-10-05 00:27:23,358 MSG: meta.py:error_handler:200 error executing request:
                Traceback (most recent call last):
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/base.py", line 95, in get_response
                    response = middleware_method(request, callback, callback_args, callback_kwargs)
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/middleware/csrf.py", line 184, in process_view
                    request_csrf_token = request.POST.get('csrfmiddlewaretoken', None)
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/wsgi.py", line 171, in _get_post
                    self._load_post_and_files()
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/wsgi.py", line 151, in _load_post_and_files
                    self._post, self._files = http.QueryDict(self.raw_post_data, encoding=self._encoding), datastructures.MultiValueDict()
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/wsgi.py", line 205, in _get_raw_post_data
                    size=content_length)
                  File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/wsgi.py", line 69, in safe_copyfileobj
                    buf = fsrc.read(min(length, size))
                IOError: request data read error

In what may be the reason? Environment: Ubuntu 10.04 Server.