NotFoundError: Not Found
   at /home/latex/website2.0/app.js:31:8
   at Layer.handle [as handle_request] (/home/latex/website2.0/node_modules/express/lib/router/layer.js:95:5)
   at trim_prefix (/home/latex/website2.0/node_modules/express/lib/router/index.js:317:13)
   at /home/latex/website2.0/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/home/latex/website2.0/node_modules/express/lib/router/index.js:335:12)
   at next (/home/latex/website2.0/node_modules/express/lib/router/index.js:275:10)
   at /home/latex/website2.0/node_modules/express/lib/router/index.js:635:15
   at next (/home/latex/website2.0/node_modules/express/lib/router/index.js:260:14)
   at Function.handle (/home/latex/website2.0/node_modules/express/lib/router/index.js:174:3)
   at router (/home/latex/website2.0/node_modules/express/lib/router/index.js:47:12)