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Request URL: http://www.minenergia.gov.co/documents/10180/586633/AVISO+DE+CONVOCATORIA+CM-08-2014.pdf/426182bf-1238-4482-b645-98f1f66f0ffe
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.