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Request URL: http://www.minenergia.gov.co/documents/10180/1157884/Formato+3+-+Contribuciones+Facturadas+V2013.xls/20690a23-1be1-451b-84e1-7df2d06623ef
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.