It's coming from an app that you installed https://apps.shopify.com/partners/developer-864b2462021496a9if you install it again the error will go away. another workaround is on sales channels click on themes and then click on Actions and then click on edit code inside the snippets folder you can add a new file call it orbislabs_sitemap_noindex.liquid (it doesn't matter if the file is actually empty)
