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Request URL: http://www.minenergia.gov.co/documents/10192/23994237/180418_usu_residenciales_gas_comb_x_red.pdf/c14dae23-aca8-4e05-8a43-05a52f48523b
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.