Service example on trailsjs.io and in these docs have incorrect function call

https://trailsjs.io/doc/en/build/service.html#implement-reportcontroller

_line:_ this.services.ReportService.getLatest(cik)
_returns:_ undefined error which stems from **this.services**
`TypeError: Uncaught error: Cannot read property 'ReportService' of undefined`

_correction:_ **this.app.services**


Am I missing some config to avoid this error?