Channel URL Format leads to 404s for individual entries I've broken my news channel but I don't know how I did it, or consequently to fix it.

If one clicks on 'I just installed Craft' or 'Continue reading', it will take you to the URL I specified in the Section settings using the Craft control panel, but it results in a 404. 

It didn't do this at first, then (I think this is when it broke) I changed the entry URL format from news/{postDate.year}/{postDate.month}/{slug} to just {postDate.year}/{postDate.month}/{slug}. After I got the 404s assumed I couldn't do that so I changed it back, but it's still broken.

I'm quite new to this kind of thing so I apologise if I'm wasting anyone's time. Any help would be much appreciated. Thanks.
It turned out that when I deleted news/ from the entry URL format, I also deleted it from the entry template path as well because I misunderstood what that field was for (and forgot to revert that change when everything broke).

Thanks to @Brad for drawing my attention to it.