Now whats happening is that it's correctly showing the "Next week" category, however it doesn't show the other two and gives the error I said above right under the latest news. I did some research so before you ask, I do have news in all 3 categories.
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I can tell you straight away the problem is that you're including the script multiple times within the same page, it was never designed to do this unfortunately.
but! I'll make a couple of changes then post it here, basically it would allow you to have the multiple includes on the one page, but if you wanted to view comments for a particular post you'd either have to show the comments on a different page or have only 1 of your includes do that. Sounds confusing but I'll explain once I've made the changes.