Error: Failed to lookup view "404" in views directory "/home/ubuntu/FomographServer3/nodejs/app/views"
   at Function.render (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/application.js:580:17)
   at ServerResponse.render (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/response.js:1012:7)
   at /home/ubuntu/FomographServer3/nodejs/error-handler.js:54:11
   at Layer.handle_error (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/layer.js:71:5)
   at trim_prefix (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:315:13)
   at /home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:335:12)
   at next (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:275:10)
   at /home/ubuntu/FomographServer3/nodejs/error-handler.js:20:5
   at Layer.handle [as handle_request] (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/layer.js:95:5)
   at trim_prefix (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:317:13)
   at /home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:335:12)
   at next (/home/ubuntu/FomographServer3/nodejs/node_modules/express/lib/router/index.js:275:10)
   at SendStream.error (/home/ubuntu/FomographServer3/nodejs/node_modules/serve-static/index.js:121:7)
   at SendStream.emit (events.js:311:20)