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Request URL: http://www.minenergia.gov.co/documents/10180/558364/An%EF%BF%BDlisisProducci%EF%BF%BDnCementoCaliza4trimestrey2semestre2014.pdf/028061da-6db2-40cc-9f39-faf2ec6ab093
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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.