Can't get the web app to run.

I cloned the repo.
Went inside app and ran
 `yarn install`
 `yarn start`
 and got this page
<img width="1409" alt="screen shot 2017-09-22 at 10 25 43 pm" src="https://user-images.githubusercontent.com/14262127/30769774-a5bece72-9fe5-11e7-874c-b99b77da914c.png">
