Error during importing "guidemaker-default-template/utils/includes"

```
There was an error running your app in fastboot. More info about the error:
Error: Could not find module `guidemaker-default-template/utils/includes` imported from `guidemaker-default-template/helpers/contains`
```

As is see in the source code this util is not provided in the package,
import includes from '../utils/includes';

This happens after the guide folder structure changed.
The error disappear after I rerun `ember serve`