That’s half of it. You’ve shown us your item, but not the code that you wrote into your .sitemap file. Without seeing what you’ve put in there, we can’t tell you how exactly how to fix it. I’m not trying to be a jerk about this, we just encourage people to provide lots of information so that we don’t have to go back and forth trying to help. It saves everyone time.
Out of curiousity, why are you using sitemaps? If you’re just getting started with OH, I’d recommend learning the semantic model instead and creating pages in the UI. I like sitemaps, but they have more limitations.
When you post your code, please use code fences so that it’s easy to read and debug.