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Request Method: GET
Request URL: http://arabspatial.org/en/blog/blog/2015/02/20/enid-linking-sustainable-agricultural-and-rural-development-to-food-security-and-poverty-reduction-in-upper-egypt-arabic/
Raised by: wagtail.core.views.serve

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.