"ember install ember-cli-betamax" throws error

[jamesarosen]

$ ember install ember-cli-betamax
version: 0.2.3
Could not find watchman, falling back to NodeWatcher for file system events.
Visit http://www.ember-cli.com/#watchman for more info.
Installed packages for tooling via npm.
installing
  create tests/helpers/cassette.js
Installing browser packages via Bower...
  cached http://sinonjs.org/releases/sinon-1.12.2.js#e-tag:2081e3-2c
  new version for http://sinonjs.org/releases/sinon-1.12.2.js#*
  resolved http://sinonjs.org/releases/sinon-1.12.2.js#e-tag:2081e2-2c
Installed browser packages via Bower.
installing
The `ember generate` command requires an entity name to be specified. For more details, use `ember help`.

Initially, I suspected that this library was trying to run a bare ember generate command, but I don't see it anywhere in the codebase.

[walter]

For the benefit of anyone coming across this, I got things working with the steps outlined in the README (rather than the standard "ember install" for addons):

npm install simplereach/ember-cli-betamax --save-dev
ember generate ember-cli-betamax

The "ember install" didn't work for me, so I fell back to the above.