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

URI:/diamond/flexbox.xhtml;jsessionid=node0o2hc84d425h21dzdq480g9m3j4600966.node0
STATUS:404
MESSAGE:/flexbox.xhtml Not Found in ExternalContext as a Resource
SERVLET:Faces Servlet
Powered by Jetty:// 9.4.36.v20210114