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Request URL: http://www.minenergia.gov.co/documents/10180/557824/InformeFinalAudienciaPublica2011VersionFinal.pdf/0e6ecaaf-d270-4ced-ac03-456507e25b2a
Raised by: wagtail.documents.views.serve.serve

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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.