500服务器错误，我不知道怎么了，ajax，djang

Question

我有这些代码，我已经用了几个小时，但我不知道是什么错了。

我一直得到500个服务器响应，当我触发ajax时，它甚至不会在视图定义中开始调试。

我真的很茫然，任何帮助都会很棒！

    $('.cheque_info_edit_button').live('click', function(){

var new_cheque = {
    // cheque number is taken from the cell, not input box for this one.
    cheque_no: $(this).closest('td').closest('tr').find('.inv_prof_cheque_no').text(),
    their_bank: $(this).closest('td').closest('tr').find('.new_their_bank_input_ajax').val(),
    our_bank: $(this).closest('td').closest('tr').find('.new_our_bank_input_ajax').val(),
    cash_in_date: $(this).closest('td').closest('tr').find('.new_cash_in_date_input_ajax').val(),
    cheque_amount: $(this).closest('td').closest('tr').find('.new_cheque_amount_input_ajax').val(),
    info_type: 'edit'
   };

    var cheque_json = JSON.stringify(new_cheque);
    $.ajax({
       type: 'POST',
       url: '/best_choose/invoice/profile/inv_add_or_edit_cheque/',
       data: cheque_json,
       success: function(){
       // do stuff
}

更新：我不认为我的视图在语法上有任何问题，所以我取出它并添加了回溯，csrf令牌有问题吗？我的所有其他ajax函数都工作

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/best_choose/invoice/profile/inv_add_or_edit_cheque/

Django Version: 1.3
Python Version: 2.7.2
Installed Applications:
['django.contrib.auth',
'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin',
 'SY_SYSTEM.sy_system',
 'django.contrib.humanize']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.middleware.csrf.CsrfResponseMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


 Traceback:
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  178.                 response = middleware_method(request, response)
 File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/middleware/csrf.py" in process_response
  287.             response.content, n = _POST_FORM_RE.subn(add_csrf_field, response.content)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/http/__init__.py" in _get_content
  596.         return smart_str(''.join(self._container), self._charset)

Exception Type: TypeError at /best_choose/invoice/profile/inv_add_or_edit_cheque/
Exception Value: sequence item 0: expected string, NoneType found