Cannot run reference or test - keep getting Testing script failed with code: 1

Hi there,

I keep getting
`Testing script failed with code: 1`
when i run npm run reference

When I chug to my project gulp file and run gulp reference I get the following error

```
[gulp-chug] Removing temp file \node_modules\backstopjs\gulpfile.tmp.1464731152205.js
[gulp-chug] Returning to parent gulpfile...
```

Would you have any ideas?

node -v = 4.4.4
npm -v = 2.15.5