The web server is currently configured to display /404.html when resources are not found, but since that file does not exist, the web server logs were filled with errors related to that missing file.
As an interim measure, I created a very simple 404 page for the pelicanthemes.com site at that location. As a more proper and longer-term solution, we should ensure that a 404.html page is created in the generated project root as part of the build process.