Sample Code crashes

I configured the ```browserstack.json``` file with my username and key.
I run ```./node_modules/.bin/browserstack-runner``` command but it crashes.

<img width="1440" alt="screen shot 2018-09-27 at 4 53 11 pm" src="https://user-images.githubusercontent.com/5382204/46142897-0aec7c00-c276-11e8-867e-1f36407f0162.png">
