Can't seem to run locally

After a clone and a fresh install, running `npm start` results in the following error:

```
acetate-cli-sample/node_modules/acetate/lib/cli
path.js:7
    throw new TypeError('Path must be a string. Received ' + inspect(path));
    ^
TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.resolve (path.js:1148:7)
```