I have an app that uses 1.9. It will work fine for weeks and weeks,
and then out of the blue a page that has just worked will crash with
this:

Request Method: GET
Request URL:

Django Version: 1.9
Python Version: 2.7.5
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'core.data',
'core.alerts',
'core.reports',
'app.cdsem',
'app.semvision',
'app.developer',
'dispatch',
'ui',
'configuration']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'middleware.LastSiteUrl']

Traceback:

File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py"
in get_response
 174.                     response =
self.process_exception_by_middleware(e, request)
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py"
in get_response
 172.                     response = response.render()
File "/usr/lib/python2.7/site-packages/django/template/response.py" in render
 160.             self.content = self.rendered_content
File "/usr/lib/python2.7/site-packages/django/template/response.py" in
rendered_content
 137.         content = template.render(context, self._request)
File "/usr/lib/python2.7/site-packages/django/template/backends/django.py"
in render
 95.             return self.template.render(context)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render
 204.                 with context.bind_template(self):
File "/usr/lib64/python2.7/contextlib.py" in __enter__
 17.             return self.gen.next()

exceptions must be old-style classes or derived from BaseException, not str

Request Method:         GET
Request URL:
Django Version:         1.9
Exception Type:         TypeError
Exception Value:

exceptions must be old-style classes or derived from BaseException, not str

Exception Location:
/usr/lib/python2.7/site-packages/django/utils/module_loading.py in
import_string, line 23

If I go the exact same URL again it will work.

Anyone have any idea what could be causing this or how I can debug it further?

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