Re: 'url' template tag throws and error after upgrading to 1.4

I have tried with runserver and debug = True and it gives me the error but when I turn off debug then the site loads fine.
Then I installed gunicorn and with debug = true and the error appears but with debug = False the site loads fine but without the static content.
I don't know if this is a clue about something wrong in the static settings or if it's just a setting in gunicorn.

Any idea?

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