HTTP ERROR 404 /flexbox.xhtml Not Found in ExternalContext as a Resource

URI:/diamond/flexbox.xhtml;jsessionid=node01l4d2xnb5fcir5so6bxc0s28c5772820.node0
STATUS:404
MESSAGE:/flexbox.xhtml Not Found in ExternalContext as a Resource
SERVLET:Faces Servlet
Powered by Jetty:// 9.4.36.v20210114