Error: Failed to lookup view "error" in views directory "/root/spelunker/views"
   at EventEmitter.render (/root/spelunker/node_modules/express/lib/application.js:580:17)
   at ServerResponse.render (/root/spelunker/node_modules/express/lib/response.js:971:7)
   at /root/spelunker/app.js:43:7
   at Layer.handle_error (/root/spelunker/node_modules/express/lib/router/layer.js:71:5)
   at trim_prefix (/root/spelunker/node_modules/express/lib/router/index.js:315:13)
   at /root/spelunker/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/root/spelunker/node_modules/express/lib/router/index.js:335:12)
   at next (/root/spelunker/node_modules/express/lib/router/index.js:275:10)
   at /root/spelunker/app.js:32:3
   at Layer.handle [as handle_request] (/root/spelunker/node_modules/express/lib/router/layer.js:95:5)