forgot to install express
Gregory Hill was kind enough to write me and point out that on page
201 in Chapter 6, we copy the Tweet Counter's
server.js file into a
new location, but we never install express in that directory. If you
try to run the program as-is, you'll get an error. So make sure you
run the following command before running the server.
$ npm install express@3
I've also included instructions on how to use Express 4 in your app if you're interested.