Rename MIDDLEWARE_CLASSES to
MIDDLEWARE in settings to see if that changes anything.
If not, remove one by one (except static). There are some changes to
the static files middleware [1], but I can't really relate that to
your error.

Is there anything in your project requirements that also uses six?

There's no diff between 1.10.x and 1.11.x on six.py, but this code
looks like a possible root cause:

# Here's some real nastiness: Another "instance" of the six module might
# be floating around. Therefore, we can't use isinstance() to check for
# the six meta path importer, since the other six instance will have
# inserted an importer with different class.
if (type(importer).__name__ == "_SixMetaPathImporter" and
        importer.name == __name__):
    del sys.meta_path[i]
    break

[1] 
https://docs.djangoproject.com/en/1.11/releases/1.11/#django-contrib-staticfiles

On Mon, Sep 4, 2017 at 3:32 PM, Derek Zeng <zen1...@gmail.com> wrote:
> If I turn off debug mode, it gives me 500 error and showing the same stack
> trace in the console.
>
> I also tried 1.11.4, still the same error.
>
> On Mon, Sep 4, 2017 at 2:33 AM, Raffaele Salmaso <raffa...@salmaso.org>
> wrote:
>>
>> On Sun, Sep 3, 2017 at 4:26 PM, Derek Zeng <zen1...@gmail.com> wrote:
>>>
>>> When I use django==1.10.7, this does not happen.
>>> When I use django==1.11a1 this happens.
>>
>> Why 1.11a1? Current is 1.11.4
>>
>> --
>> | Raffaele Salmaso
>> | https://salmaso.org
>> | https://bitbucket.org/rsalmaso
>> | https://github.com/rsalmaso
>>
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Melvyn Sopacua

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