how to fix the OSerror[Errno 5] input/output error when deploy django project with uwsgi and nginx?

My enviorent is :ubuntu 12.04, django 1.6.1 python 3.3.4 nginx 1.4.7 and uwsgi 2.0.2 The problem came when I registered a new user,Exception location is where the code is "if form.is_valid()".

Exception value:[Errno 5] Input/output error

I just test it with the django's development server, NO ERROR!

SO I think the problem lies somewhere with uwsgi or Nginx?

my code dealing with the registration is :

def register(request):      form = UserCreationForm()      action = "注册"      template_name='accounts/auth_form.html' if request.is_ajax() else 'accounts/auth.html'      if request.method == "POST":                  form = UserCreationForm(data=request.POST)           ***if form.is_valid():#Exception here***              form.save(request=request)              username=request.POST.get('username')              email_domain=request.POST.get('email').split('@')[1]              if request.is_ajax():                  return TemplateResponse(request,"accounts/register_feedback.html",locals())                else:                  return TemplateResponse(request,"accounts/register_feedback.html",locals())      return TemplateResponse(request,template_name,locals())   

Then my uwsgi configuration is just like what the django document provides:

[uwsgi]  socket = 127.0.0.1:3031  chdir = /home/fox/KuaiPan/fox/  pythonpath = ..  env = DJANGO_SETTINGS_MODULE=myauth.settings  module = django.core.handlers.wsgi:WSGIHandler()  processes = 4  threads = 2  stats = 127.0.0.1:9191

This problelm is really annoying,how to fix it? THX in advance!

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