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Request Method: GET
Request URL: http://www.minenergia.gov.co/documents/10180/1157884/Formato+6+-+Contribuyentes+Exentos+V2013.xls/8e746006-e61f-4f62-8df3-4ec5553623fd
Raised by: wagtail.documents.views.serve.serve

This document does not match the given filename.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.