Compilation failure -- OutboundSMSButton.js

I'm receiving the following error after an `npm start` for a clean repo clone.

```
./src/OutboundSmsPlugin.js
Module not found: `/Users/mrcr/Code/Refresh/plugin-sms/src/OutboundSmsButton.js` does not match the corresponding path on disk `OutboundSMSButton.js`.
```