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Request URL: http://www.minenergia.gov.co/documents/10180/23848602/OCI-Inf.2017-013+Auditor%C3%ADa+Gesti%C3%B3n+Energ%C3%ADa.pdf/c0b07182-b9b0-46d2-a377-8ac6b409a69e
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.