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I'm having the exact same problem.
After creating a clone of the template and downloading it, I did some changes and uploaded it to the server, changed my default to the clone. Up till now everything works great. After generating some items, I decided to uploaded some changed files to a particular section (news). For some reason unknown to me, I can upload news_archive.html and several others, but news_item.html always gives me that error.
Help!
Lenny