Long answer: Instead of sitting back waiting for a response, you should search, provide more information, and test with latest versions of deluge and libtorrent
I installed Deluge on a Pi over the weekend. For some reason last night Deluge just kept stopping. I too was getting the error mentioned here. It's just gone bananas and today I'm getting all sorts of errors with the Deluge WebUI. I think it was the poor How-To-Geek article I followed. Going to format the card and start again with that Youtube tutorial.