Use service in popover and modal

I can’t seem to call services from popover & modal. I use singletons by declaring them all in app providers. But modal and popover cannot reach those singletons.

Gulp version: CLI version 3.9.1
Gulp local: Local version 3.9.1
Ionic Framework Version: 2.0.0-beta.11
Ionic CLI Version: 2.0.0
Ionic App Lib Version: 2.0.0
ios-deploy version: 1.8.3
ios-sim version: 5.0.4
OS: Mac OS X El Capitan
Node Version: v5.1.0
Xcode version: Xcode 7.3 Build version 7D175

Can you show us your code to better reproduce the error?