昨天一切都工作正常，今天我进入管理员，当我点击“usuarios_aux”模型时显示此错误...

Unable to lookup 'u' on Usuario_aux or Usuario_AuxAdmin

为什么会这样？继承人追溯 .

环境：请求方法：GET请求URL：http：//provisional.jetint.webfactional.com/admin/clients/usuario_aux/ Django版本：1.7.3 Python版本：2.7.9已安装的应用程序：（'django.contrib.admin .apps.SimpleAdminConfig'，'django.contrib.auth'，'django.contrib.contenttypes'，'django.contrib.sessions'，'django.contrib.messages'，'django.contrib.staticfiles'，'adminplus'， '客户'，'currier'）安装中间件：（'django.contrib.sessions.middleware.SessionMiddleware'，'django.middleware.common.CommonMiddleware'，'django.middleware.csrf.CsrfViewMiddleware'，'django.contrib.auth .middleware.AuthenticationMiddleware'，'django.contrib.messages.middleware.MessageMiddleware'，'django.middleware.clickjacking.XFrameOptionsMiddleware'）模板错误：在模板/home/jetint/webapps/jet_test/lib/python2.7/Django- 1.7.3-py2.7.egg / django / contrib / admin / templates / admin / change_list.html，第91行的错误无法在Usuario_aux或Usuario_AuxAdmin上查找“u”81：{％endif％} 82：{％end阻止％} 83：84：{％csrf_token％} 85：{％if cl.formset％} 86：{} 87：{％endif％} 88：89：{％block result_list％} 90：{％if action_form和actions_on_top and cl.full_result_count％} {％admin_actions％} {％endif％} 91：{％result_list cl％} 92：{％if action_form and actions_on_bottom and cl.full_result_count％} {％admin_actions％ } {％endif％} 93：{％endblock％} 94：{％block pagination％} {％pagination cl％} {％endblock％} 95：96：97：98：{％endblock％} 99：Traceback：File get_response中的“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/core/handlers/base.py”137. response = response.render（）File渲染103中的“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/response.py”.self.content = self.rendered_content文件“/ home / jetint / webapps / jet_test / lib / python2.7 / Django-1.7.3-py2.7.egg / django / template / response.py“in rendered_content 80. content = template.render（context）File”/ home / jetint /我们bapps / jet_test / lib / python2.7 / Django-1.7.3-py2.7.egg / django / template / base.py“in render 148. return self._render（context）File”/ home / jetint / webapps /在_render 142中的jet_test / lib / python2.7 / Django-1.7.3-py2.7.egg / django / template / base.py“ . 返回self.nodelist.render（context）文件”/ home / jetint / webapps / jet_test / lib / python2.7 / Django-1.7.3-py2.7.egg / django / template / base.py“in render 844. bit = self.render_node（node，context）File”/ home / jetint / webapps /jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/debug.py“在render_node 80中 . 返回node.render（context）文件”/ home / jetint / webapps / jet_test /lib/python2.7/Django-1.7.3-py2.7.egg/django/template/loader_tags.py“在渲染126中 . 返回compiled_parent._render（context）文件”/ home / jetint / webapps / jet_test / lib /etthon2.7/Django-1.7.3-py2.7.egg/django/template/base.py“在_render 142中 . 返回self.nodelist.render（context）文件”/ home / jetint / webapps / jet_test / lib /python2.7/Django-1.7.3-py2.7.egg/django/template/base.py“在渲染844中.bit = s elf.render_node（node，context）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/debug.py”在render_node 80中 . node.render（context）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/loader_tags.py”在渲染126中 . 返回compiled_parent . render（context）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/base.py”在_render 142中 . 返回self.nodelist . 在渲染844中渲染（上下文）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/base.py”.bit = self.render_node （节点，上下文）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/debug.py”在render_node 80中 . 返回node.render （context）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/loader_tags.py”在渲染65中.result = block.nodelist . 渲染（上下文）文件“/home/jetint/webapps/jet_test/lib/python2.7/Django -1.7.3-py2.7.egg / django / template / base.py“in render 844. bit = self.render_node（node，context）File”/home/jetint/webapps/jet_test/lib/python2.7/ Django-1.7.3-py2.7.egg / django / template / debug.py“在render_node 80中 . 返回node.render（context）文件渲染65中的“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/loader_tags.py” . result = block.nodelist.render（context）在渲染844中输入文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/base.py”.bit = self.render_node（node，context ）在render_node 80中输入文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/debug.py” . 返回node.render（context）文件渲染1207中的“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/template/base.py”. dict = func（* resolved_args，** resolved_kwargs ）result_list 307中的文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/contrib/admin/templatetags/admin_list.py” . headers = list（ result_headers（cl））在result_headers 101中输入文件“/home/jetint/webapps/jet_test/lib/python2.7/Django-1.7.3-py2.7.egg/django/contrib/admin/templatetags/admin_list.py” . return_attr = True File“/ home / jetint / webapps / jet_test / lib / python2 . 7 / Django-1.7.3-py2.7.egg / django / contrib / admin / utils.py“in label_for_field 324. raise AttributeError（message）Exception Type：AttributeError at / admin / clients / usuario_aux / Exception Value：Unable to在Usuario_aux或Usuario_AuxAdmin上查找'u'

我怎么能解决这个问题？

模型：

class Usuario_aux(models.Model):
    user = models.ForeignKey(User)
    clave = models.CharField(max_length=100)
    correo = models.BooleanField(default=False)

admin.py：

class Usuario_AuxAdmin(admin.ModelAdmin):
    list_display = ('user', 'correo')
    search_fields = ('user', 'correo')
admin.site.register(Usuario_aux, Usuario_AuxAdmin)
python django django-models