Hi there! I haven't touched Twine in a long time, so I'm not familiar with the updated version, but based on the error message I would say it should probably be an easy fix of renaming the element with ID "story" with something else. Just go into the StoryInterface passage > scroll down to the bottom where you'll see <div id="story" role="main"> and change "story" to something else. Whatever you change it to, for example "mystory", you'll have to go through the story Stylesheet to change every instance of that ID's styling as well. Kind of like this:
I believe that should fix it!