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Request Method: GET
Request URL: http://www.minenergia.gov.co/documents/10180/23724155/INVITACION+PUBLICA-07-2016.pdf/39a05565-f9c3-40ee-b84e-59fa9e99e0a5
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.