Error: Failed to lookup view "undefined.handlebars" in views directory "/app/views" at app.render (/app/node_modules/express/lib/application.js:493:17) at res.render (/app/node_modules/express/lib/response.js:798:7) at /app/app.js:132:12 at callbacks (/app/node_modules/express/lib/router/index.js:164:37) at param (/app/node_modules/express/lib/router/index.js:138:11) at pass (/app/node_modules/express/lib/router/index.js:145:5) at Router._dispatch (/app/node_modules/express/lib/router/index.js:173:5) at Object.router [as handle] (/app/node_modules/express/lib/router/index.js:33:10) at next (/app/node_modules/connect/lib/proto.js:193:15) at Object.handle (/app/node_modules/express-useragent/index.js:43:9)