ENOENT: no such file or directory, open '/home/ubuntu/Dropbox/public/abtweb/about.md'

Error: ENOENT: no such file or directory, open '/home/ubuntu/Dropbox/public/abtweb/about.md'
    at Object.openSync (fs.js:436:3)
    at Object.readFileSync (fs.js:341:35)
    at /home/ubuntu/Dropbox/routes/default.js:51:33
    at Layer.handle [as handle_request] (/home/ubuntu/Dropbox/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/ubuntu/Dropbox/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/ubuntu/Dropbox/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/ubuntu/Dropbox/node_modules/express/lib/router/layer.js:95:5)
    at /home/ubuntu/Dropbox/node_modules/express/lib/router/index.js:281:22
    at param (/home/ubuntu/Dropbox/node_modules/express/lib/router/index.js:354:14)
    at param (/home/ubuntu/Dropbox/node_modules/express/lib/router/index.js:365:14)