Error: No default engine was specified and no extension was provided.
   at new View (/home/app/elli/node_modules/express/lib/view.js:61:11)
   at Function.render (/home/app/elli/node_modules/express/lib/application.js:587:12)
   at ServerResponse.render (/home/app/elli/node_modules/express/lib/response.js:1039:7)
   at /home/app/elli/config/express.js:241:25
   at Layer.handle [as handle_request] (/home/app/elli/node_modules/express/lib/router/layer.js:95:5)
   at trim_prefix (/home/app/elli/node_modules/express/lib/router/index.js:328:13)
   at /home/app/elli/node_modules/express/lib/router/index.js:286:9
   at Function.process_params (/home/app/elli/node_modules/express/lib/router/index.js:346:12)
   at next (/home/app/elli/node_modules/express/lib/router/index.js:280:10)
   at Layer.handle [as handle_request] (/home/app/elli/node_modules/express/lib/router/layer.js:91:12)